Abstract
Both novel and multiple ultrastructural studies based on different principles show relationships of cytoplasmic lipid bodies and ribonucleic acid (RNA) of potential importance to RNA metabolism in human mast cells. The methods include general ultrastructural morphological observations, imaging of RNA with an EDTA regressive stain, imaging of the incorporation of radio labeled uridine by ultrastructural autoradiography, postembedding immunogold labeling of uridine, ribosomes and small nuclear ribonuclear proteins and ultrastructural in situ hybridization detection of poly(A)-positive messenger RNA. Altogether these studies implicate human mast cell lipid bodies in RNA metabolism and are analogous to earlier similar studies which showed that human mast cell granules also curtain RNA.
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