RNAs are the direct products of genes, and these small RNAs can bind to other specific messenger RNA (mRNA) molecules and either increase or decrease their activity, for example by preventing an mRNA from producing a protein.
What causes stretch marks? Stretch marks are caused when the skin rapidly stretches as a result of sudden growth or weight gain. The stretching causes the middle layer of skin (dermis) to tear, allowing the deeper skin layers to show through, forming stretch marks. The dermis contains strong, inter-connected fibres that allow your skin to stretch as your body grows.
The exact cause of most birthmarks is unknown, but vascular birthmarks are not hereditary. They are thought to occur as a result of a localized imbalance in factors controlling the development and migration of skin cells.irthmarks are caused by overgrowth of blood vessels, melanocytes, smooth muscle, fat, fibroblasts, or keratinocytes. Dermatologists divide birthmarks into two types. Pigmented birthmarks caused by excess skin pigment cells include moles, cafe-cafÃ©-au lait, spots And mongolian. spots