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(A) Immunocytochemical studies of an extirpated tumor coinjected with GFP-labeled MEFs reveals tumoral nodules surrounded by encircling GFP immunoreactivity. Identical results were observed when the spheroids were coinjected with GFP-HMS-1. (B) Higher magnification of these tumoral nodules reveals their location within a space containing GFP immunoreactivity in its lining and luminal erythrocytes (arrows).
