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Fig. 3. The proline-rich domain of p42POP mediates profilin binding. (A) Yeast two-hybrid analysis with profilins 1 and 2a (PFN1/2a) as a bait and different p42POP fragments as prey. Only fragments containing the proline clusters gave a positive reaction (+). (B) Autoradiograms obtained after SDS-PAGE of pellets (P) and supernatants (S) derived from pull-down assays with profilin-1-coupled Sepharose (PFN1) or BSA-coupled Sepharose (control). Both types of Sepharose bead were incubated with in-vitro-translated, radioactively labelled full-length p42POP or the N-terminal (N-POP) or C-terminal (C-POP) fragment. Only C-POP was precipitated by PFN1 beads.