Fig. 5. Fibronectin-stimulated tyrosine phosphorylation of PLC-
1. (A) Null+ cells were allowed to adhere to fibronectin-coated dishes (10 µg ml-1) in serum-free medium for the indicated times. The cells were then lysed and each lysate was precipitated with anti-PLC-
1 antibody followed by blotting with site-specific antibodies against tyrosine-phosphorylated-PLC-
1 or PLC-
1 as indicated. (B) Null+ cells expressing wild-type PLC-
1 or an N+C-SH2-domain loss-of-function PLC-
1 mutant (N+C SH2-) (Ji et al., 1999) were allowed to adhere to fibronectin (10 µg ml-1) for the indicated times. The cells were than lysed and the lysate were precipitated with anti-PLC-
1 antibody and then blotted with antibody against tyrosine-783-phosphorylated PLC-
1 or PLC-
1 as indicated. Cells maintained in suspension (Susp) were used as a control for time 0.