[Term] id: PR:000025557 name: amyloid-beta precursor protein isoform APP639, signal peptide removed form def: "An amyloid-beta precursor protein isoform APP639 that has had the signal peptide removed." [PRO:DAN] comment: Category=modification. Requested by=Alzforum. synonym: "APP/iso:APP639/SigPep-" EXACT PRO-short-label [PRO:DNx] intersection_of: PR:000025531 ! amyloid-beta precursor protein isoform APP639 intersection_of: lacks_part SO:0000418 ! signal_peptide