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Effect of the cAMP level on hormonal imprinting in Tetrahymena.

Augmentation of the cAMP level has no positive effect on hormonal imprinting in Tetrahymena. Artificial elevation of the cAMP level may inhibit the development of imprinting or may result in abnormal imprinting. The role of Ca2+ is of great importance in mediation of the imprinting mechanism. Generally, this role is not influenced by an elevated cAMP level but, exceptionally, the latter may effect the mechanism of imprinting.