Table 1. Phosphopeptides of p140Cap protein.

	M (Da)	p140Cap phosphopeptides sequence
Ser 45	1580.7613	43-RFpSNVGLVHTSER-55
Ser 987	1208.5540	985-RGpSDELTVPR-994
Ser 1003	1593.7919	997-TEKPSKpSPPPPPPR-1010
Tyr 396	1825.9329	392-GEGLpYADPYGLLHEGR-407

In vivo phosphorylated p140Cap was immunoprecipitated from MCF7 human breast cancer cells and four phosphopeptides were recovered by liquid chromatography, analysed by mass spectrometry (MS) and subjected to MS² and MS³ fragmentation. We indicate the position of phosphorylation sites within the NCBI Reference sequence NM_025248.2, the masses of the peptides (expressed in Da) and their amino acidic sequence.