fruitless Gene products truncated of their male-like qualities promote neural and behavioral maleness in Drosophila if these proteins are produced in the right places at the right times.

Abstract excerpt

To bring GAL4 production under the control of the sex promoter (P1) contained within Drosophila's fruitless gene, a gal4 cassette was previously inserted downstream of P1. This insert should eliminate male-specific FRU(M) proteins, which normally contain 101 amino acids (aa's) at their N termini. Thus males homozygous for the P1-gal4 insert should be courtless, as was briefly stated to be so in the initial report...

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