Assertion: complement component | /r/HasProperty | activated by upstream steps of the pathway
Facets:
value: in the classical pathway
type: OTHER
Source sentences:
text: In the classical pathway, the complement component—hereafter abbreviated by the "C" preceding the protein number— termed C1s, a serine protease, is activated by upstream steps of the pathway, resulting in its cleavage of the native, parent ~200 kilodalton (kDa) C4 protein—composed of three chains.:288