Immunoelectron microscopic localization of calmodulin and phospholipase A2 in spermatozoa. I.
1986
Using the Lowicryl K4M embedding technique, together with indirect immunoferritin or immunogold labeling on ultra-thin sections, tubulin, calmodulin and phospholipase A2 were distinctly localized in ejaculated bull spermatozoa. Calmodulin was concentrated on the plasma membrane, nudeus, post-acrosomal substance, and, in lesser amounts, between coarse fibers and axonemal microtubules of the flagellum. Phospholipase A2 was distributed evenly along the plasma membrane, nudeus, acrosome, post-acrosomal substance, and in the flagellum, on mitochondria, fibrous sheath, coarse fibers, between coarse fibers and axonemal microtubules. Antibodies to tubulin labeled only axonemal microtubules, induding the central pair of microtubules. Patterns of tubulin labeling were identical
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