Western blot of oocyte plasma membranes. Membranes of 50 oocytes,
independently injected with either pSRIImRNA or pHtrIImRNA, have been
isolated by subsequent centrifugation over a sucrose and nycodenz
density gradient. The blotted membranes have been incubated with an
antibody (Qiagen, Hilden, Germany) against the C-terminal 6×
histidine-tag of the proteins. The two prominent bands in lanes 1 and 3
at ≈85 kDa and ≈25 kDa can be assigned to pHtrII and pSRII,
respectively. Lanes 2 and 4 show control membranes of not injected
oocytes.