since magnesium can substitute for calcium in supporting aggregation , especially in the presence of low calcium concentrations , and platelet aggregation is inhibited at low ph , the present study was designed to examine the effects of magnesium and low ph on 45calcium binding to human platelets , and to determine whether such effects might be associated with calcium binding to glycoproteins i ( gpi ) or iib/iiia ( gpiib/iiia ) , the putative fibrinogen receptor .
C0017968
glycoproteins
C0016011
gpiib/iiia