Imagem 1

Example: RPL12P6, GAPDH, ENSG00000237984

Summary

Gene Name MAST3
Plot displaying the genomic locations of a parental gene (in chr3) and its retrocopy(ies). Each line represents a retrocopy.
Specie Monodelphis domestica
Full Name N/A
Also known as -
Coordinate chr3:450813500-450916912
Strand +
Gene summary N/A

Retrocopy(s) from MAST3

Retroname Coord Strand Genomic Region ENSG
MAST3P1 chr4:338937291-338937991 - Intragenic
N/A UCSC

Expression

Transcript Sequences

>XM_016432188.1
CGCGGAGCCCGAGCGGGAGCGGGAGCAGGAGCGGGAGTGGGAGCTCAGAGTGCCACCCGCCTGGCTGCTGTGGGCCACCCGCTGCTGCGGACCACAGCCGGCTCCATGGACGAACCGAGCATCCTGAGGCGCCGGGGACTGCAGAAGGAACTCAGCTTGCCACGACGGGGAAGGTCCTGCCGCAGTGGCAACAGGAAAAGTCTGGTGGTGGGGACACCGTCGCCCACCCTCTCCCGACCCCTGTCCCCACTCTCTGTGCCTACAGCTGGCAGCAGCCCCTTAGATAGTCCTCGGAACTTCTCGGCCAGCACGACTGTAAACTTCCCCTTCGCACGAAGGCTGATAAACCAACAATCTTCATGCAGTCATGGGCCCCGGACTGACAGGGCTGATGGCCGGAGATGGTCGcttgcttccctcccctcctcaggcTACGGGACCAATACCCCCAGCTCCACTGTCTCGTCATCCTCATCTTCCCGAGAGCGGCTGCACCAGCTGCCATACCAGCCAACGCCAGATGAGCTCCACTTTCTTTCCAAGCACTTTCGCAGCTCAGAGAGCATCGTGGATGAAGATGGGGGCCGCCGCTCTCCCTGCATGCGGCCTCGCTCCCGCAGCCTCAGCCCCGGGCGAACCACAGGAGCTTTTGACAGTGACATTGTCATGATGAATCATGTCTACAAGGAGCGATTTCCTAAGGCCACTGCACAGATGGAGGAGCGGCTGCAGGACATCATTACTACCTTCTCCCCCTCTAACACCCTGGCCCTGGCCGATGGTGTCCTGAGCTTCATTCACCACCAGATAGTGGAGCTGGCTCGAGACTGTCTGGCCAAGGCCCGGGAGGACCTGGTCACCTCCCGCTACTTCTTGGAGCTTCAGGAAAAGCTAGAGAAGATGCTGCAAGATGCCCACGAGCGCTCAGAGAGCCAAGAGGTCTCCTTCATCGGCCAGCTGGTTCGGAAGCTCCTGATCGTCATCTCCCGGCCGGCGCGGCTCCTGGAGTGCCTGGAATTTGATCCAGAAGAGTTCTACCACCTCCTGGAAGCAGCAGAAGGACATGCCCGGGTGGGTCAGGGCATCAAGACAGACATTCCTCGATACATCATTGGTCAGTTGGGCCTCACCAAGGACCCTCTAGAGGAGATGGTGCAACTGGGTCCTCCGAATGCTGGCTCGACTGCACCTGAGGATGGAGACCCACCCGAGAACCGATCTCTCACTGTGCCTTCCCGGAGGAAACCCTGTGAGAGCGACTTTGAGACCATCAAACTGATCAGCAACGGGGCATATGGGGCTGTGTACCTGGTCAGGCATCGAGAGACCCGCCAGCGCTTTGCTATCAAGAAGATCAATAAGCAGAACCTAGTGCTCCGGAACCAGATCCAGCAGGTGTTTGTGGAGCGGGACATCCTGACCTTTGCCGAGAACCCCTTTGTCGTCAGTATGTTCTGCTCCTTTGAGACTCGGAGGCACCTCTGTATGGTCATGGAATATGTGGAAGGCGGAGACTGCGCCACACTGCTAAAGAACATGGGCCCCCTCCCTGTGGACATGGCCCGGATGTACTTCGCAGAGACTGTCCTGGCTTTGGAGTATCTTCACAATTACGGCATCGTGCACCGGGACCTCAAGCCTGACAACCTGTTAATCACATCCCTGGGCCATATCAAACTAACGGACTTTGGGCTGTCCAAGATCGGGCTGATGAGTATGACCACCAATCTGTATGAGGGGCACATCGAGAAGGACGCCCGGGAGTTTGTGGACAAGCAGgtCTGTGGGACCCCTGAATACATTGCACCTGAAGTGATCTTCCGACAAGGCTATGGGAAGCCGGTGGACTGGTGGGCCATGGGCGTCATCCTCTATGAATTTCTCGTGGGCTGTGTCCCTTTTTTTGGTGACACCCCCGAGGAACTTTTTGGCCAAGTCATCAGTGATGACATCATCTGGCCAGAAGGAGATGAAGCACTCCCTGCTGATGCTCAGGACCTGATCACTAAGCTGCTGAGACAGAGTCCCCTGGACCGATTAGGCACAGGTGGTGCCTACGAAGTCAAGCAGCACCCCTTCTTCTTCAACCTTGACTGGACGGGTCTCCTACGGCAGAAGGCAGAATTCATCCCACAACTGGAGGCGGAAGATGACACTAGCTACTTTGACACTCGATCGGAACGTTACCGCCACCTGGGGTCAGAGGATGATGAAACAAATGATGAGGAGTCGTCTACAGAAATCCCCCAGTTTTCTTCCTGCTCACACCGGTTTAGTAAGGTTTATAGCAGCTCTGAATTCCTTGCTGTTCAGTCACACTTTTCTGAGAGAAGCTATAGTGAGGACAAGGAGGAGAGGTCGGAGAGGTGGGACCGGGGTTCGGGTGAGGAGGAGAAGACCCGCCCTTTGAGCACAGAGGTCAGgctGAGGTCCTGGACGTCATCCGGCTCGCTGCGGCACTCCTCGTCTTCGTCCTCCCAGCCAGAGCGGAGCCAGAGCCCCTCAGCCCTGAGCACCACCTACAGCCTGGACCCCATGCCCAAGTTCGCCTTCTCTTCCGAGGACGAAGGCCCTTGCCAGGGACCGGCCAAACCTGAGAGGCCCGTTTTTGTGCTGGGAGACCCCGAGGAGCTGGCGAGAGAAACGGCTAAGGTGTCTGCCCTCACAGCGGACGTTTCCAGCCTCAACCACGTCCGATTACGGAGTAATAGTACCGGGGCAAAGAACTCCACGCCTCGGGTCCTGGAAGGTGGCGGGCCGGGCCGGCGTGGCCAGAAAGAAACGCCTGAGAAACAGAAGACGTCCCCCGGGGGCAGCCGGGTCCCCAAATCGGCCTCTGTCTCCGCCCTCTCCCTAGTCATCACTTCAGACGACTGCAGCAGCGGGGCCCTCATGAGTCCCATCTCCCCCCATTCCCTCTCCTCCAACCCCTCCTCCCGGGACTCCTCCCCGAGCCGGGACTCCTCCATCGGCATCACCAGCCTGCGGCCTCCCATCATCATCCACAGCTCCGGAAAGAAGTTCGGCTTCAGCCTGAGGGCCATCCGCGTCTACATGGGCGACAGCGACGTCTACACTGTGCACCACATGGTCTGGAGCGTGGAGGAGGGCAGCCCGGCCCAAGAAGCTGGCCTGCGGGCGGGAGACCTCATCACCCACATCAACGGGGAGTCCGTGCTGGGCCTGGTTCACATGGACGTGGTGGAGCTCCTGCTGAAGAGCAACAACAAGATCTCCCTCAGAACCACGGCCCTGGAGAACACCTCCATCAAGGTGGGGCCGGCCCGAAAGCACAACAACAAAGGCAGGATGGCCCGGCGAGGCAAGAAAAGCAGGAAGCGTGAGAGTCAGGACAGGCGAAAGTCTCTCTTCAAGAAGATCTCCAAGCAGTCCACGATGCTGCACACGAGTCGGAGTTTCTCATCTGGGCTCCACCACTCCCTATCTTCCAGCGAGAGCCTTCCTGGCTCTCCTACCCACAGCCTGTCCCCTGGCCCTGCCACCCCCTGCCGCAGCCCCGCTCCCGATGCCCCCCCAGATACGGTGTCTCCACAGAGCACTTCACCCTCGTCCAGCACGCCCACCTCCCCGGCGGGCCACATCCGGCCCAGCTCCCTGCATGGCCTGGCCTCCAAGCTGGGGGCCCCGCGCTACAAAGTCGGCCGCCGGAAGTCGACGAGCAGCATCCCTCCATCCCCGCTGGCCTGTACGCCCTCACCGGGACCCCAGCCCCCGTCGCCCCAGAGATCTCCGTCTCCTTTACCGGGTTACCCCAAAAACCTCTATGCCTTCCAGGGGAAGACCTTGTCGCCCCCGATGATCAGCCGGCAGACGTCCAGGCCGCGGAGCGCCGAGACCCCCCGGTCCCCCCTCCTGAAGCGAGGGCTGTCTGCCGACAAAATCACGCCCTGCTCCATGGAAAAGAAGCCCCTGGGGGGCCGAAAGCTCACCCTCGAGATGCCGGCGGGGGACGGGGACGGCCTCGAGGAGATGTCGGTCCAGGCCTTCTCGGGGGCCGGTTACACAGGCACGGCGAGCCGGGGGAGAGACTGGGCCGGAGACCGGCACGACAGGGACCAGGAGGTGGTGGTCATGAGACGCCTAAACCTGTCCGAGCGTCGAGACTCGTTCAAAAAGCAAGAGGCCGTCCAGGAGGTGAGCTTCGACGAGCCCGAGGCCCCGGGGGACGAGGGCCCCCGCGGGCAGGAGGGCCGGGGGCCACGGCCGGGGGCGCGAGAACAAAAGCCGCCCCCCGTGCCCCAGATCGCCGTGCAGGGCTCCGAGGGCGACGTGCACGAGCCGGGCTCGGCCGAGTGGGAGTGCCAAGGCTCTTACCCCCCCCTCCAGCTGCTGGCCAAGGTCTACACTGAGCAGACGGACGGGACCAAGGCGGTGGAGTACAAGAGCCTCTCGGCCCAGCGGCGGGGCAGCAGGGACCTCCGGGACTTGAGCTCGGGGGGGCAGCAGCAGCCCCCCAGGGCCGGCCGGCCTCTTCGGGCCCCCCTGCAGGCCGCCAAGTCCCTGCCCATTCTCCAGCTCTCGGGAGGCCAGGAGCGGGCAGGACCTGAGCCTCGGACTCCCAGAGCGAGTCAGCGAGATGCCACGGGGCCATCGAGGAAGATGGATGGGGATCGGCGCTAGAAGCCAGGTCCACGGTGGGAGTCACAGGAAGAGGGGGCCTCCCACCCCCCAGCCCATCCCATCCCACCCGCTCTGCATCCTCCTCTCGGTGCGAGTCGATGTGTGTGTCCTGTGACGGGCGCGGGAGAACCTCAGGAAGAACGAGCCTTCGGAACATGCGTAGCccttaaaaagacaaaaacagagaaacccAGACCCAGAACAAGGAAACATTGACTCGCGAGAACCACAACAAGTGTTTTTCTACAAACTGCAAAGAAGTCTCCTTATTTTTGTAGCGTGCAGGAGCTGGGGGGTGAGAGGAGGCTGGCCCGGCCGCTCGGCCCGTTGTAAATAGCCGGAGGCAGATCCCGAGATTAATTTATTACTTTTATAAGCTAAGATGAGATGTGAGCACAGCTTCTGTGAAGGCACTTTGACCTCCTCCCCGCGGGAGGAGCCCTGGATCCCGCCTGTCCGTGGTTTTTCTGTGTGGGGTTGGGGGTGCTTGAACTTCCCTGAGACTGTAGTGTTGACCCGGGCGGCGCCACTCCAGAGCGGGCAGGGCTGCCTGAGGCCCGGCTGGCACCCGCCCGCCCTGGGCAGCAGGGTGAGGGGTCTCTTCCCTGGCCCCGCTTGACAAAGACTTGTGGGAGCAGCTGCTCGAGGGTGGACCGAAGGTCTGTCTAGCCAGAGGTGTCTGGATGGCGCTGTGTGACTCAGATGCCATAGAACCTCCCAGAGAAGTGGCCCCGTTTTCTCCTTCCTCGAGATGCCCCCTCACCCCCCACACATGCCCGTGCCCGGCAGCAGTGGCTAGAACCACACATTTCCCTCCCCTGCTGATGGCAGGCCTTTCTCTGTGGCCGCTGCCCTTAAAGaggtctccttccctccctcccccccgcCCCAGACAGACCGCGCACCTTGGGAGGAAAACGAAAGCCCCGCTGCCGAAGAGAAGTGCCGGCGGGGGTCAGGATTGGGGTGCCGAGTCCCTGGACAGTTTCAGTCCAGTTTGGGAGGCCCCTGGGAGCCCGGAGGTCAGGGCTCGGGGGGTCCTTGGGTGACAGAACTTGCCAGAGGCCACGTAGCCActtagtggcagagctgggactagaagCTGACTTTCTTGACTCCCAGCCCTGGGATCTTTTCCCTTCCCAAGCACTACCCCGCGGCTGCCAGAAACCAGCCTGGAGTTCCCCTAGACACAGTGCAGACTGCCCCAGCAGTTCCCCCTTTGGACCCTCTGGGCCCCGGGACTTCTGCTCTTGCTCTCTGAACTCTGTTTCCAGCATTTTGAGGATCTGAACGTCCAGAATCTTACAGAGAAAAAGTAGAAGCCTGGGAAGGTCCAGGACCTAGACAGACCTCCATCCTCTCACTGAGTGGACGCTGTCCCTGCCCTGTCTTGTGGGGTCAAGAGGGGTGTTTCAGGGCTGGAACGAGGCCTGAGGGTCCCAGAAGGGACGAGCCAGCCTCCCTACGTCAGGCAGTTTGGCTGAATGGAAGGGGAGAGTGGAGGTTTCCATGAGCAGAGGAGGCTTCTCTTCCTTTATGAGACCACATTCCTGGGCCCGGCTTTCCCCGTCATCCTGACTCGGCCAAACAGAAGGCTGGTTCCTTGTGCAGCCTTCAGGCTTCCAGGGAGTCAGCGGGGGTGGGAGACCCTCCGAGCCTCAGCTGAAGACAGCTGTCATGCCACCGTCCAGGATGCTAGATGATGGACTTGGCCCTTTgagtgctgctgctgctgctgctgctgctgggttTTAAACTGGTTTTACCTTTGTTTTCAGTGCCTAAAGGATCTAGAACGTTCCTGACATGGCTACAATTTAACTTGGCAGAATGGAATGATAGATGGAAAGAcaagttcagattctgcctctggcccttcctggctgtgtgactccaggcttAGGATGACCTCTCTGAGCCTTCAGGTTTCTCACCTGAGGAATGAGAGGAGTGGGCTTGCTGgactcttgtttgttttttaaaacatctaATCTTCTAAGGATCAGTTCCAAAACggaggatgaagtgacttgcccagggtcacacagctaggaaatgtctgaggccggatttaaaCTTAGCGAGGACCTCGTATCTCCCGGCCTGGGTCTCAAaccatggagccacccagctgtcttaGCTTGTTGGACTcttttcccttccagttctgtaGTCCCTCTGTAACATCCGTAACAGCCTTCTTAATAGACAGTCTGTTGCAGCTGGAAAAAATGGATCCTCATCTGGCCAATCCTCAGCCTTGGGCTGGTGACAGGCCCATAGGTAATTGACCAGTGGGCTCTTCCGGCAGACTTGCAGAGTCACTCCTGCCCCAGGAAGCGTCCCTTCTCCATTTTGGAGACATCCCTCCTTTGATCCGACCAATTGCAACATCTTGGTTCCAAAGGAAACCGAATAGAAGTAGGCTTTGGCTCTGTTAAGGTCAAGATGGCCGTCTCTACACGCTGGGGTCAGCCCGGTGGACAAACGGGCATTTATTACACATTTGTGACCCCGAGCCCGTCCACAGAGACACCTGCCCTGCCCTCTGGAAGCTCACGTTTTTGTGCACTGAAGTCGGGTTTTTGTCCGAGCTTGCAGCCTTGAACCCAACAGAAAAGGCCGCTGATTGGCAGGCTTTGGTTTTCTGGAATAGGAGCTGGAGGGATGTAGAGGACTAAGGAAATGGGCAGTCAGGTAAATTtcccaattaaatatattatctttttaaccttttttttttaatttcctcggCCCCTATTCAAGCTTGAAGACGTGCATCCTGCCAGTCTTGAATTCTCATATTCAGATGATCTCCACTTTAAAAGAATGTGATTTCTCGTCCTTAGGGGACTAGATGAAGCCAGcttccccttcttctccccaGGTCCTGGAACCAGTTTTCTCCATGCTTCCCCAGTCCTTCCTGGGCCCGCATTCCAAAGGTTTCCCAGGGGATGTGGCCTGGAAGGGCCGAAGCCCCCGCTCGGGGGTCAGTCTCCAGGATAGCCCAGGAGGAATGACCTCATCCTCCATTTTGCCATTTTGTGTGTAGACCTCCGAGGTCATGGTTTGGGGGCTCCTTCCCTCGGTTCTCGTCTCTGTGTGTTCCTGGGCCCCCCATTGCCCCTTCCGCCTTGTAGCAgctcctggcacatggtaggggTCCTGGGAGAGCTTTCTGAATGGACTTCAAGTCTGTTCGATGATTAAACACCCACTTAGAGGGTTGGAAGTGGGTCTGAGATGAGCATTAAAGGCAGTCAGCCATCGCTCCTACAATGCCACTGAGGTCAAGGCACCGAGGGCTGAGTCTGGAGTCTCCCCCTTTTTGGTGCCCAGGCCCCTTGGATGGTCTGATAGAGCCTAGGGCCCGCCCTCTCTGAACCCCTTTGCAAATAGCCAAAGGAAATGGCAGGTTTCTATTAAAGGGCTGTGAAAAGGAAGATGTCATGTGCCCATCCGAGTGGGTacacaccccacccccacccccatatctCCAATTTCCGGTGGGGAGACCCCTAGGATCAGTCACTTCCTTTCCTTGGGCTTCTGatttccacctctgtaaaatgggggctgGGTTAGCTCAGGAATTCTTAGCCTTCATCCCTTTCCCAAAACCAcgtttttaaatgcctaaaacaAGATAGGATCACAAATGAAACCTCGGGAAGAGCCACTGCCCAAAACCTCAGTGTTTTAGGTTCACAGAAGCCCAGATAACCCCTAACGTAAGATGCCTTGTAGCGTTGGCACCCCATCCCCCTTGGAGACGGCTAAGTGGAGCAACAGGCCCGGAGTTGGgaaggcctcagacactagctgtgtggctctgaacaagtcacttcacccctcttggactcagtttccttatctataaagtgggagTAATGACAGCCCCTGCCTtcagttgtgaggatcaaatgaaatgatatttgtcaAGTGTTTAGCGCAGGACCTGGCACATTTGGACACTGTCTGCGTGCTTAtgcccttcctttcccccaagcAGAGAGAACCCCTAGGGTCCATTTTCAGATATGCCATCTTTTATAAACTTTTGAACTGTGGAATAGCAGGTTTGGAAGGGAGCTTGGCATATACACAGAATAGAAGGAAGCCTCACGTACAGGACGCTAAAACTGGGAAAGGCCCAATACCGTGGGGCGGCAGATTTGGGAGGAATCTTAAATTCTCTGAGCTGAGGGGGGATTTGAAAACAGAACATCAGGATTTCCTCGAAGCATTCCCCCTCTCCAGAGGGCTTCAGGCAGAGCCCACAGCCGAGAGCCAGTTTAGACCGAGGATCTTGGCTCCTATTTACAGAGACTTGTCCAAGGCGAGCAGTGGCCCAAGTCAGGATTGGACTAATGACCCCTGCTCAGTGGTCCGGCCTTCCTGCCTCCCTAATCGTGctgaccatttttttttttaagctcaccCCTGGGCAAAACAAAGAAGCAGCAGCAACAGAAACCCACTGGTCCAGCTTCCAACCTCGGACCTGGATTTGGGGCAAAATGTCCATCCACAAAACCAAAAACGAAACCCTCACTCGTGTGGGTCCACAGCGTGGGGGCTCCGGGACCATGGGGGGAAGGGGCACGTTTATGACAAAGCCAGGAGTGGTTGCAAATGTCTGTTGTGCCCCCTAGGGAGGGGGGTGCTGAGGCTGGTGGGTTCTGAGCTGGGCATCAGCTTAGGAAGTCCTCATGAGGGTGAGGGAGGGACTAGGCCACCAGGCTGCCTATGGAGCGGGTGGACTGGCCCAGGTTGGAAACAGGGCAGAGCCCACCTCTGATAAGTTGTAGAAAGAAGCAGGCCTGTAAGCGAAGTCTGCATGTACGATGATAAAGGAACTTAAGGATTTCCAGGGACTTTCCGGGGCCAAGTTTGAATGCACCACAACAGCCATGGATCTGTTTCTCTTGAGTTTCCTTTCAGACAGGAAATAGACATTTCTAAATGGtgggggttttttttccccttttgaagTCAGGTGGTTGCATCCTTTAATGACTTAGCCCCAAGTCTAATCTTGGATTCTTTCAGATCTTCCAGATCTTAGATGTTcagcaaaacattttttcatggtgGAAACTGGAACAGATCCATCCAGCACAGGGAATCCTTGCATTGTGACTTGTGTGACGGAAGTTGTGTTCCTTTTGTAGGAAGCCCCAAAAACTCACCCACACAATTCCCACAGGGTCCCGGCTGACTTCCCGAAGCTCATTGTAAATCTGGCATGAATGCTAGTATGTCTCGGTATGGAGCAAGGCAGCCACTTCTTTAGGGAGCATTCTGGCCTCGTCAGAGGTTCAACCTTTGGTTGGAGAAAGAAATCATAAAGGCCTGGCCTCCACCCCTAGAGTTGTCACTAGGAACTTTCTGGGACCAAAAAGATGGACCTAGAGCTGGAACAAATCTGAGAGGCCACCTTGGACGAGCTGGCCAGTGGAATTTAATCCCTGACTTTTTATCTAGTGCTCTTGGCCCTATGGTACCCTGAGGcaacctcatttcacagatgggtaaactgaggcctgGGAGAAGAGATTTGTCCAAGTTCCCAGAATATGAGCCAGGGCTAAGAACCCAGACTTCCCAAGGACCAGGCCCTTCCTATTtgctctcctccttcctttttgttcAACTAAATCTAGAGAACAAAATAGGATGGTCAGATGAGGAAAATTCTGTCCagaactcattttaaaaaaacaaaccaggaaATGTTCAATGTGTCTATgggaatttttacatttttttttcagcctttttccctaccccccaaaaaagttGGAATTCAACTATAAATGCCTGAGTCAACTTCTTGTTCGTCTTTTGGGAAACATTTCATATAATTAAAGACTTCTAATGGAAAATTCACCAGCTGGGGAACTCACAGCCGTGGCATAAACTGTCTGCTTCCTCCCATGGTTTTAAGGACAAGAATTAGCCAGATCCGCTTCCTCCCCTTTAGCTGGCCACAGTGCGATTTGTCACCCCCACACTCCTTTAAACAGCTGGTCCCCCTTCAGACACCTTTTGCTACCAGGCTTCCGTGTAGTTGCCAAGTTTCCGGCACTCTCCCGGCCCCCTCTTGTGACGGTGAGTTTTGTAAGTCATCTGAGCTGCTCCTTCCCATTCTTGTTTTCTAGGCCGCCTATGTTTACATTTCAGTATGCATGTGTGCGATTTCTGGGGTTGTGCTGAGAATCCTGCCTTTTACATGTCCAATTTCTAGAACTCCTGTACAGTTTGTATTGCTGATGACTCGGTGCCACGCTACCAAGCCCACGTCGTGTGACTTTTTTAATGTGACCAAAGCCATTGAGTagcccccctttcccctccctgcaCCCCCAGGCCCCTAGGTCTGCTGGGCCTGGGTACTTCATTCATTGCCCCAAGGTCTCCCTGTCACCCCAAAAGGAGCTTCCCTCTGCACGGAAGACAGAGGTTGTTCTGCCCATTCCATCGTTAGCTGGCCACAGTGCATGACTCGTTCCCCCTTCTCCATATGCAGAAACCTGGGAGCATTTTCTGGGTTTtctattgaataaaaaaaataataagacaaaaa