[Term] id: PR:000021938 name: activin receptor type-1 isoform 1, signal peptide removed form def: "An activin receptor type-1 isoform 1 that has had the signal peptide removed to yield the mature protein." [PRO:DAN] comment: Category=modification. synonym: "ACVR1/iso:1/SigPep-" EXACT PRO-short-label [PRO:DNx] intersection_of: PR:000000199 ! activin receptor type-1 isoform 1 intersection_of: lacks_part SO:0000418 ! signal_peptide