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They are structural elements and energy sources of cells necessary for normal cell growth, differentiation and function

As we age, collagen levels naturally decline, leading to sagging skin

Yun et al

The functional domains of 5 -reductase-2 have been deduced from in vitro mutagenesis-transfection analysis of natural mutations of 5 -reductase-2 gene in cultured mammalian cells 14 , 17 , 18 , and mutagenesis analysis of 5 -reductase-1 isozyme 19

Researchers find blocking or reducing these CC chemokines and their receptors, such as CCL2, CCL3, CCL5, CCL7, CCR1-5, CCR9, and CCR10, can ameliorate tissue swelling and bone erosion (27, 29, 121124)