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Phosphorus and divalent cations in dog, rabbit, and human platelet dense bodies as deduced from electron microprobe studies of air-dried whole mounts.

Dense bodies have been examined by electron microprobe techniques in air-dried whole mounts of dog, rabbit, and human platelets. On the basis of measurement of the intensities of the X-rays produced when dense bodies are probed for 100 seconds, dog and rabbit platelet dense bodies contain on the average less phosphorus and calcium, but more magnesium, than do human platelet dense bodies. Dense bodies of dog and rabbit platelets thus appear to resemble more closely those of pig platelets than those of human platelets.