The endocrine function of the thymus develops earlier than lymphocytopoietic. Thymalin is produced by epithelial cells in the thymus primordium. It is released into the blood and regulates differentiation of T lymphocytes in the liver, the initial hemopoietic organ. The hormonal and lymphopoietic functions of human thymus are united on weeks 7.5-8 of embryonic life.
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