Structural features of PLC1 and mutations in plc1 alleles. The positions of the amino acid residues of the PH domain, EF-hand calcium binding domain (EF), catalytic X and Y domains, PEST motif, and C2 domain in Plc1p are shown in parentheses. The positions of mutations in individual plc1 alleles are indicated (▾), along with corresponding amino acid and nucleotide changes.