Cover image
COVER Drosophila melanogaster metaphase chromosomes (top), an embryo that has been subjected to in situ hybridization with a probe made from a gene homologous to the B. subtilis ipa-6d gene (middle; intense labeling of a small group of cells is seen), and a diagram of approximately 20 kb of annotated genomic sequence (bottom). (For details, see Rubin, p. 71.)
