Fig. 1.

The mapping of C. intestinalis extended Hox genes onto metaphase chromosomes by using FISH. Metaphase chromosome spreads prepared from 64-cell stage embryos were hybridized with two or three probes labeled with digoxigenin (red) or biotin (green) for the genes indicated at the top in A–L. Red and green arrowheads indicate the signals for the gene of the same color code. In E and G, red arrowheads with a black dot indicate the signals for Ci-Hox2–4.In A–E and G, enlargement of the chromosome with signals is indicated in Insets. (Bars, 5 μm.)