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Fig. 2. XMAP215 is a monomer. (A) Immunoblot of purified XMAP215 and a Xenopus egg extract probed with an antibody raised against the C terminus of TOGp. The antibody recognizes purified XMAP215 and a 215 kDa protein in Xenopus egg extracts. Positions of Mr markers are shown. (B) XMAP215 was incubated with (top row) or without (bottom row) an antibody to its C terminus before uni-directional shadowing. In the presence of antibody, the XMAP215 rod was decorated by a single globular structure that had the size of an antibody molecule, suggesting that XMAP215 is a monomer. Scale bar: 100 nm.