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Fig. 5. Photomicrograph of 4 s.p. allantoic distal tips in co-culture with TSC colonies. After 9 days in TSC culture, TSC colonies (arrows) from a line derived from a wild-type early-streak ExE continued to proliferate on, and in close proximity to, blue ROSA26 +/– allantoic tissue. Scale bar: 200 µm.