Abstract
Expression of proteins encoded by the ras proto-oncogenes was examined in extracts from normal rat organs using anti-ras p21 antibodies generated against synthetic peptides. The highest level of ras p21 was found in brain (cerebrum) and was predominantly of c-Ha-ras origin. Levels of brain ras p21 did not vary from the newborn period of 3 months of age. Moderate levels of ras p21s were detected in lung, spleen and thymus. In contrast to the p21 in brain, these levels varied with the age of the rats and were encoded by other members of ras proto-oncogene family (Ki-ras or N-ras). This organ specific expression of different ras genes might be related to developmental control of gene expressions.
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