Summary
Insulin stimulates the glucose uptake ofTetrahymena pyriformis. This shows the presence of insulin receptors inTetrahymena, consequently receptors may be present in a level of phylogenesis, where the natural contact between the given hormone and the cell is unnecessary and impossible.
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Csaba, G., Lantos, T. Effect of insulin on the glucose uptake of protozoa. Experientia 31, 1097–1098 (1975). https://doi.org/10.1007/BF02326980
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DOI: https://doi.org/10.1007/BF02326980