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- W2040279379 abstract "The inducing capacity of sulfhydryl (SH)-containing amino acids (cysteine and glutathione) on post-nodal pieces (PNPs) of stage 4 chick blastoderms was investigated. PNPs were treated for different lengths of time with chick Ringer's solution (control group) or chick Ringer's solution containing cysteine or glutathione, followed by culturing for 2–10 days on Spratt-Haas agar medium or on the chorioallantoic membrane of 8-day chick embryos. Control PNPs rarely showed differentiation, but those treated with the amino acids for six hours or longer developed structures such as neural tissue, notochord, somite mesoderm, and nephric tubules. The pulsatile tissue was only seen in the PNPs cultured for four days or longer. Two-four hours of treatment was too short to provoke induction in a statistically significant number of PNPs. The highest frequency of induction was noted in those pretreated with glutathione (8 μg/ml) for eight hours, followed by culturing for four days. The magnitude of the inducing capacity and toxicity of the amino acids were concentration dependent: a deleterious effect was observed at 14 μg/ml, the highest frequency of induction occurred at 8 μg/ml, but the frequency decreased as the concentration decreased; at 2 μg/ml all PNPs remained viable, but only a few (9–14%) showed differentiation. The inducing capacity of the amino acids was counteracted by equimolar concentrations of p-chloromercuribenzoic acid or w-chloroacetophenone. The effects of glutathione (8 μg/ml) differed from those of Hensen's node grafts in that the former caused sublethal cytolysis and inhibited H3-uridine uptake in competent ectodermal cells during the first 18 hours of cultivation." @default.
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- W2040279379 date "1975-07-01" @default.
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- W2040279379 title "Studies on cell differentiation: Inducing capacity of sulfhydryl-containing amino acids on post-nodal pieces of chick blastoderms" @default.
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- W2040279379 doi "https://doi.org/10.1002/jez.1401930105" @default.
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