Updated project metadata. The stoichiometries of TFIID and SAGA (TAF10-containing complexes) have been quantified in mouse and human erythroid cells. TAF10 immunoprecipitations (IPs) have been carried out in erythroid cells at different stages of differentiation and development followed by quantitative mass spectrometry (MS). Interactions of TFIID and SAGA with several transcription factors and specifically with GATA-1 have been identified. GATA-1 immunoprecipitation (IP) in MEL cells also identified the reverse interactions with subunits of the TFIID and SAGA after MS analysis.