Inside a lab in the picturesque Swiss town of Vevey, a scientist gives tiny clumps of human brain cells the nutrient-rich fluid they need to stay alive.

WASHINGTON, May 12 (Reuters) - U.S. lawmakers will ask regulators to investigate whether the make-up of a panel overseeing animal testing at Elon Musk's brain-chip startup Neuralink contributed to botched and rushed experiments.