
Sequence comparison of the YFL-1 and its variants isolated from the first and second selections. (A) Sequences of 38 clones from the first selection. (Asterisks) The YFL-1 sequences were found in 28 independent clones. (B) Sequences of 26 clones from the second selection. (Asterisks) The YFL-1 sequences were found in seven independent clones. (Dashes) The bases that are the same as in YFL-1. Slashes in position R40 of clones d-16, 22, and 24 indicate single-nucleotide deletions.










