Fig. 1. The 18304 locus is required for the control of oskar activity in anteroposterior patterning of the embryo. (A-C) Cuticle preparations of a wild-type embryo (A) and embryos derived from 18304 germline clones (B,C), which show patterning defects ranging from deletion of the head (B), to complete mirror-image duplication of posterior structures (abdominal segments and filzkörper material; C). (D) Embryo derived from 18304, oskar double-mutant mother. Such embryos completely lack posterior structures and show the oskar single-mutant phenotype.