Association of PP2Ac, but not PP2Cc, with integrin
αIIbβ3. Integrin αIIb
was immunoprecipitated from lysates of washed platelets (A) or 293
cells expressing αIIbβ3 (B) with
control antibodies: rabbit IgG, anti-αIIb, or anti-PP2Ac.
Immunoprecipitates were immunoblotted with antibodies to αIIb
or PP2Ac. C, αIIb was immunoprecipitated, as
described above, and the membrane was probed with anti-PP2Cc antibody. Results
are representative of three to four experiments.