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FII mRNA in embryonic yolk sac. (A) Detection of FII mRNA by in situ hybridization in a tissue section prepared from an E9.5 FII+/+ embryo. Note that FII mRNA is detectable at low levels (white grains in this darkfield image) exclusively within the yolk sac membrane (arrows). (B) In situ hybridization analysis showing intense signal for FII mRNA in the yolk sac membrane (arrows) of an E13.5 FII+/+ embryo. (100×.)
