RESEARCH TRIANGLE PARK – Robotic surgery firm TransEnterix is raising $13 million through a stock offering – and the news sent its share prices down some 33 percent Wednesday. TransEnterix, which trades under the symbol TRXC, priced more than 37 million shares at 35 cents for the offering. Its shares then fell 17 cents to 36 cents. The cash will be used for "general corporate purposes, including working capital," the company said. RTP-based robotic device firm TransEnterix lands $25M stock deal