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Little lipophilic (lipid-soluble) hormones distribute across the plasma membrane and then interact with intracellular receptors in the nucleus/cytosol. The receptors are all structurally associated, being part of the nuclear receptor super family. The resulting hormone-receptor difficult frequently binds to regions of the DNA and affects the transcription of particular genes. The Small lipophilic hormones with intracellular receptors includes the steroid hormones which are synthesized from cholesterol for instance the female sex hormones estrogen and progesterone, thyroxine that is produced by thyroid cells and is the principal iodinated compound in animals, retinoic acid that is derived from vitamin A, and vitamin D that is synthesized in the skin in response to sunlight.
figure: Cellular signaling. (a) Endocrine, (b) paracrine, (c) autocrine.
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