Fas and Tumor Necrosis Factor Receptor 1 (TNFR 1) are two prototype members in the death receptor family. A novel protein that associates with the intracellular domains of Fas and TNFR 1 was recently identified and designated F1A alpha and FEM 1 beta. F1Aa/FEM1b is the homologue of C. elegans sex determining protein FEM 1. FEM 1/F1Aa is cleaved by CED-3 and caspase. FEM 1/F1Aa associates with CED-4 and its mammalian homologue Apaf 1. Overexpression of F1Aa induces apoptosis. F1Aa is therefore a novel member of the death receptor associated protein that mediates apoptosis. F1Aa is expressed in a variety of human and mouse tissues.

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