The structure of the Pish (t) gene and its deduced amino acid sequence. (A) Positions of Tos17 insertions within the Pish(t) gene in mutant lines NC7869 and NC8589. Exons are indicated by black boxes. (B) Deduced amino acid sequence of the Pish(t) gene product. Amino acids 52-98 shown in underlined italics, constitute a predicted CC motif. The three conserved motifs in the NBS region are also underlined.