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. 2005 Jun 27;33(Web Server issue):W255–W261. doi: 10.1093/nar/gki496

Figure 1.

Figure 1

PROSITE motif PS00138. The first, second, third and seventh amino acid positions can accommodate only glycine, threonine, serine and proline, respectively. The fifth position can accommodate serine or alanine. The eleventh position can accommodate alanine or glycine. The tenth position can accommodate serine, threonine, alanine, valine or cysteine, and the fourth, sixth, eighth and ninth positions are wildcard residues (x). The serine residue in the third position is part of the catalytic triad.