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 a common side effect of growing fast. They can result from packing on pounds of muscle (a happy problem), or just plain packing on pounds of fat. However, if you're rapidly packing on pounds of fat then you've got worse problems than just stretch marks. Check out our Quick Fat Loss section!