receptor-type tyrosine-protein phosphatase C isoform CD45RA A receptor-type tyrosine-protein phosphatase C isoform CD45R that is a translation product of some mRNA whose exon structure and start site selection renders it capable of giving rise to a protein with the amino acid sequence represented by UniProtKB:P08575-8 or a 1:1 ortholog thereof. PTPRC/iso:CD45RA Category=sequence. Requested by=CL. Note: This isoform includes the region encoded by the variable exon 4(A), and lacks the region encoded by exons 5(B) and 6(C). CD45RA receptor-type tyrosine-protein phosphatase C isoform CD45R