these experiments indicate that ( a ) heparan sulfate proteoglycans are critical mediators of cell adhesion and heparan sulfate-dependent adhesion via pf4 is comparable in some , but not all , ways to fn-mediated adhesion , ( b ) the uncharacterized and heparan sulfate-independent `` '' cell surface '' '' receptor for fn permits some but not all aspects of adhesion , and ( c ) physiologically compatible and complete adhesion of fibroblasts requires binding of extracellular matrix fn to both the unidentified `` '' cell surface '' '' receptor and heparan sulfate proteoglycans .
C0019143
heparan sulfate
C0062503
and heparan sul