bride of sevenless

bride of sevenless
(= boss)
In Drosophila eye development, the ligand for the sevenless tyrosine kinase receptor. Boss is expressed by the central R8 cell. It is unusual as a ligand for a tyrosine receptor kinase in that it is on the surface of another cell and has, in addition to a large extracellular domain, seven transmembrane segments and a C-terminal cytoplasmic tail.

Dictionary of molecular biology. 2004.

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