1st, 2nd, 3rd-generation<unk>  compounds. The<unk> s are a class of chemical compounds that are vitamers of vitamin A or are chemically related to it.<unk> s have found use in medicine where they regulate epithelial cell growth.<unk> s have many important functions throughout the body including roles in vision, regulation of cell proliferation and differentiation, growth of bone tissue, immune function, and activation of tumor suppressor genes. Research is also being done into their ability to treat skin cancers. Currently, alitretinoin (9-cis-retinoic acid) may be used topically to help treat skin lesions from Kaposi's sarcoma, and tretinoin (all-trans-<unk>  acid) is used to treat acute promyelocytic leukemia.
Retinoid
Retinol
Epoetin beta
Vitamer
Immunoisolate
Β-Carotene
Phytosteroid
Psymberin