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.
Stretch marks are the separation of collagen of the skin. While not painful, the stretching of the skin may cause a tingling or itchy sensation. Stretch marks occur in about 50-90% of pregnant women. Typically they show up in the lower abdomen during pregnancy, but you may also find them on your thighs, arms, breasts, and buttocks. Stretch marks are more commonly found at the end of pregnancy. Some people got stretch marks when they hit puberty. If you fell into this category you may or may not get more stretch marks, or get stretch marks in different places.