FIG. 1.

A. Dynein IC transcripts in Drosophila. Samples (10 μg) of total RNA isolated from various developmental stages of D. melanogaster, as indicated at the top, along with RNA samples from the heads of D. melanogaster adults or D. simulans adults, were separated in a 1% agarose–formaldehyde gel. Hybridization with probe A (Fig. 2) revealed two major bands, corresponding to the Cdic and Sdic transcripts. Only the Cdic transcripts were detected in D. simulans. (B) Control hybridization with the probe for the constitutively expressed gene oxen (1a) shows sufficient RNA loading on all lanes. The numbers on the right indicate the sizes of transcripts in kilobases.