...and UCSC (build 29, April, 2002) using BLAST. Positions of YAC ends for GAP1, GAP2, GAP3, and GAP6 TAR clones are shown in Table 1 . With knowledge of the size of the YACs, the positions of the YAC end sequences, and the hooks in the clones towards the gaps, we estimated their sizes: GAP1, ∼15 kb; GAP2...