<span>Proto-oncogenes are genes that normally help cells grow. When a proto-oncogenemutates (changes) or there are too many copies of it, it becomes a "bad" gene thatcan become permanently turned on or activated when it is not supposed to be. When this happens, the cell grows out of control, which can lead to cancer.....Is this what you need ?</span>
<span>intrauterine insemination is the best choice here.</span>
it is a barrier with tiny openings that lets some ,but not all, matérials pass through
