[Term] id: PR:000000213 name: activin receptor type-2B isoform ActR-IIB4 def: "An activin receptor type-2B 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:P27040-4 or a 1:1 ortholog thereof." [PRO:CNA, PRO:DAN] comment: Category=sequence. Note: This isoform lacks the cluster of proline residues within the extracellular domain located immediately before the transmembrane region (known as splicing cassette I) and lacks the intracellular segment rich in basic and acidic residues (known as splicing cassette II). synonym: "ACVR2B/iso:ActR-IIB4" EXACT PRO-short-label [PRO:DNx] synonym: "activin receptor type-2B isoform 5" EXACT [PRO:CNA, PRO:DAN] synonym: "ACVR2B isoform 5" EXACT [PRO:DNx] property_value: has_archetype PR:P27040-4 is_a: PR:000000071 ! activin receptor type-2B