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Fig. 1. A schematic representation of the ABRM twitchin molecule and mutants of the
D2 peptide. (A) The motif structure of ABRM twitchin is shown together with
the region expressed as various 6xHis-fusion proteins that are used in the
present study. The D1 and D2 sites are S1075 and S4316, respectively. (B)
Phosphorylation of twitchin D2 peptide mutants by PKA. TWD2-S was
phosphorylated, whereas TWD2-A and TWD2-D were not phosphorylated.
Phosphorylation of TWD2-S was detected by SDS-gel electrophoresis as described
previously (Funabara et al.,
2001a).