Fig. 3. Expression patterns of isolated transcripts visualized through in situ hybridization. Results for five immune-related transcripts and one control transcript over the four developmental stages included in our screens are displayed. Transcripts are identified to the left of each row of images displaying their expression pattern over time. (A-E) Pre-competent larva, 1-2 hours after hatching. (F-U) Competent larvae, 10-12 hours after hatching. For all larval pictures we have chosen to display only the head, because this allows the details of expression to be discerned and there was no significant expression in the tail region for any of the genes examined. (K-V) Juveniles 1 hour after settlement. (P-W) Juveniles two days after settlement.