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Figure 5 High power photomicrographs of sections through Xenopus retinas that received heterochronic
transplants of presumptive retinal tissue from dextran-FITC labeled embryos. Embryos
were allowed to survive to the stages of initial expression of photoreceptor antigens XAP-1 (A) or
XAP-2 (B). Note that both XAP-1 and -2 immunoreactivity extends to the border of the transplant,
but not at all into it. Even transplant cells that are in immediate contact with older host cells fail to
express XAP-1 or -2 to any extent. Scale bar: 25 mm. |
