Table 1 .

The relative association rate constants of GRB2 with the plasma membrane

HRG	0 min	5 min	30 min
GRB2+WT-SHC	1.00±0.07a (4.90±0.7)b	1.63±0.10 (7.33±0.9)	1.03±0.10 (5.03±0.8)
GRB2+SHC3F	1.07±0.07 (5.14±0.6)	1.78±0.19 (7.28±0.7)	1.46±0.12 (7.16±0.9)

Times after HRG stimulation are indicated. Averages in 21–23 cells are shown with SE. These are relative values to that obtained before (0 min) HRG stimulation in cells expressing wild type SHC.

^a Mean values (+/– SE) of the relative association rate constants.

^b Frequency of appearance (molecules/sec/100 μm²).