. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MM. FIGURES 2A-C. The influence of intermedin on nucleated and non-nucleated fragments of melanophores (camera lucida tracings). 2A, 3 melanophores expanded by an injection of inter- medin 2 hours previously and drawn immediately after cutting (N, nucleated half; F, non-nucleated fragment) ; 2B, the same cells 2 hours later, after contraction of melanin has begun and just be- fore a second injection of intermedin; 2C. the same cells 2 hours after the second injection of intermedin; note that only the nucleated fragments
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MM. FIGURES 2A-C. The influence of intermedin on nucleated and non-nucleated fragments of melanophores (camera lucida tracings). 2A, 3 melanophores expanded by an injection of inter- medin 2 hours previously and drawn immediately after cutting (N, nucleated half; F, non-nucleated fragment) ; 2B, the same cells 2 hours later, after contraction of melanin has begun and just be- fore a second injection of intermedin; 2C. the same cells 2 hours after the second injection of intermedin; note that only the nucleated fragments have expanded after cutting. to contract. When intermedin was again injected into these animals two hours after cutting, the nucleated fragments and the normal cells quickly expanded, whereas the non-nucleated parts remained unchanged (Figs. 2B and 2C). These preliminary observations suggest that the cytoplasm of the melanophore requires the presence of the nucleus in order to respond to the expanding stimulus of the hormone intermedin. In any event it would appear that the ability to respond to the hormone is lost by the cytoplasm within the first four hours after separation from the nucleus. SUMMARY 1. The hormone intermedin was injected into Xenopus larvae to induce pigment cell expansion. In the expanded condition melanophores were cut and macrophage ingestion of melanin granules and cell fragments was Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
