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The ability of the isolated embryonic chick retina (12 day) to bind a steroid (cortisol) decreases when the tissue is dissociated; the extent of this decrease depends upon the method of dissociation. Trypsin and mechanical dissociation decreased cortisol binding slightly; papain dissociation essentially eliminated it. Cortisol binding decreased with time in… (More)
Glutamine synthetase (GS) activity is enhanced in cultured whole retinas when a 72 h incubation at 37°C is preceded by storage at 4°C for 2–24 h. This enhancement occurs even in the absence of glucocorticoids and is maximal in retinas from 11 to 14 d embryos. In comparison, cortisol-induced increases in retinal GS activity at 37°C are optimal in retinas… (More)