作者: Andrew Tomlinson , David D.L. Bowtell , Ernst Hafen , Gerald M. Rubin
DOI: 10.1016/0092-8674(87)90019-5
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摘要: The Drosophila gene sevenless encodes a putative trans-membrane receptor required for the formation of one particular cell, R7 photoreceptor, in each ommatidium compound eye. Mutations this result cell normally destined to form forming non-neuronal type instead. These observations have led proposal that protein receives at least part positional information developmental pathway. We generated antibodies specific and examined expression by light electron microscopy. is present transiently high levels 9 cells developing detectable several hours before any overt differentiation R7. mostly localized apices cells, microvilli, but also found deeper tissue where certain contact R8 cell. This finding suggests expresses ligand protein.