Carries a fosmid genomic fragment in which Sos has been fused in-frame at its C-terminus to superfolder GFP (and other tags or in vitro protease cleavage motifs). Genomic fragment that encompasses Sos. Sos is tagged with a '2XTY1-sfGFP-V5-preTEV-BLRP-3XFLAG' cassette.