StemCells Inc. said Tuesday it promoted Ann Tsukamoto to the newly created job of chief operating officer.

She was previously vice president of research and development at the Palo Alto biopharmaceutical company, which has about 45 workers.

StemCells (NASDAQ STEM) seeks treatments for nervous system and other disorders using human stem cells.

The company also named Stephen Huhn, M.D., as the new boss of its neural program. He's a professor on leave from Stanford University School of Medicine. Maria Millan, M.D., another Stanford medical professor on leave, was promoted to vice president of the company. She's head of StemCells' liver program and its chief medical officer.

Chief Financial Officer Rodney Young was put in charge of the company's administrative functions, including personnel and information technology.

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