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lincomycin antibiotics "The U.S. commercial space industry has made tremendous progress designing and developing the next generation of U.S. crew transportation systems for low-Earth orbit," said William Gerstenmaier, NASA's associate administrator for human exploration and operations in Washington. "Finalizing these systems in accordance with NASA’s certification requirements will not be easy. The acquisition approach we are using is designed to leverage the innovative power of industry with the expertise, skill and hard-learned lessons from NASA. This request for proposals begins the journey for a new era in U.S. human spaceflight."