Localized expression of the H-ras proto-oncogene during Ilyanassa development.

Abstract excerpt

We have immunostained Ilyanassa embryos with an antibody to the ras protein and shown that the ras gene (1) is not expressed from early cleavage through the gastrula stage, but (2) is expressed during organogenesis by both normal and lobeless embryos, (3) that the ras protein is first synthesized from the third day of development in the normal embryo and from the fifth day of development in the lobeless embryo,...

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