Expression patterns of GMC genes in the D. melanogaster cluster. The upper half shows developmental stage-specific expression patterns based on RT-PCR analyses on whole fly samples. The higher number of "+" means a higher level of expression. "-," undetectable; "ND," not determined. The bottom half shows a summary of tissue-specific expression patterns obtained from a previously published article . The presence of each block indicates a high level of expression. First to third larval instar (1L-3L) and pupal (P) developmental stages are indicated.