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Fig. 2. SNARE-immunoreactive protein bands are identical in immunoblots of total PC12 cell extracts and in extracts of isolated PC12 cell membranes. (A) Increasing amounts (left to right) of total membrane protein extracted from PC12 cell membranes were loaded as indicated, separated on SDS-PAGE and transferred to a nitrocellulose membrane. SNAP-25-immunoreactive material was identified by anti-SNAP-25 (MAB331) antibody at a position characteristic for monomeric SNAP-25 and at
100 and
230 kDa, respectively. (B) Similar blot as shown in A for protein samples from whole PC12 cells directly lysed in SDS-sample buffer.