FIG. 4.

Polyribosome profiles of late mesenchyme blastula embryos incubated in the absence (A) and presence (B) of emetine. Cultures were incubated in parallel with those described in Fig. 1C except that [³H]leucine was absent. The profile for the control culture is from the 0.5-hr point and that for the emetine-treated culture from the 3.3-hr point. The stage of development in the two cultures was similar. Total counts in the gradients are 23,830 cpm (A) and 25,391 cpm (B). Notations as in Fig. 2.