Assertion: platelet | /r/HasProperty | brought into contact
Facets:
value: with collagen
type: OTHER
Source sentences:
text: Platelets are activated when brought into contact with collagen (which is exposed when the endothelial blood vessel lining is damaged), thrombin (primarily through PAR-1), ADP receptors (P2Y1 and P2Y12) expressed on platelets, a negatively charged surface (e.g. glass), or several other activating factors.