This photo provided by the Centers for Disease Control and Prevention shows a feeding female Anopheles stephensi mosquito crouching forward and downward on her forelegs on a human skin surface, in the process of obtaining its blood meal through its sharp, needle-like labrum, which it had inserted into its human host. California researchers hatch malaria-resistant mosquitoes and use a groundbreaking technology to ensure the insects pass on the protective gene as they reproduce.