Figure 1.

Predicted amino acid sequence of the FBP21 cDNA reveals a zinc finger motif and two WW domains. (A) Amino acid sequence of FBP21. The zinc finger motif is boxed. The two WW domains are underlined with a solid line. The 15-aa spacing between the two WW domains is underlined with a broken line. This spacer distance is conserved between the WW domains of the putative splicing factor FBP11, FBP21, and the yeast U1-associated splicing factor PRP40. (B) A blast search aligning the zinc finger of the splicing factor U1C with the zinc finger of FBP21. The alignment was the best fit obtained by using the blast search.