Michigan State University Oct 10 2025 Michigan State University scientists have pinpointed the molecular "switch" that supercharges sperm for their final sprint to an egg - a breakthrough that could reshape infertility treatments and pave the way for safe, nonhormonal male contraceptives . Sperm metabolism is special since it's only focused on generating more energy to achieve a single goal: fertilization," said Melanie Balbach, assistant professor in the Department of Biochemistry and