* HK->Shanghai Connect daily quota used 3.7%, Shanghai->HK daily quota used 3.6%
* HSI -0.3%, HSCE +0.0%, CSI300 -0.1%
* FTSE China A50 +0.3%
July 6 (Reuters) - Hong Kong stocks closed lower on Tuesday, as healthcare firms slumped in line with their mainland peers on worries over lofty valuations.
** At the close of trade, the Hang Seng index was down 70.64 points or 0.25%, at 28,072.86. The Hang Seng China Enterprises index fell 0.04% to 10,269.6.
** The sub-index of the Hang Seng tracking energy shares dipped 0.1%, while the IT sector rose 0.62%, the financial sector ended 0.5% higher and the property sector dipped 0.27%.
** The Hang Seng healthcare index fell the most, tumbling 5.1%, tracking losses in their mainland-listed peers, where the CSI300 healthcare index declined 3.8%.
** Jinxin Fertility Group Ltd , Shanghai Fosun Pharmaceutical Group Co Ltd , WuXi Biologics , and Hangzhou Tigermed Consulting slumped between 8.3% and 10.6%.
** The top gainer on the Hang Seng was Haidilao International Holding Ltd , which gained 4.16%, while the biggest loser was WuXi Biologics (Cayman) Inc , which fell 8.41%.
** The Hang Seng tech index extended decline to finish 0.9% lower, amid continued worries over regulations.
** China's antitrust regulator is set to formally block Tencent Holdings Ltd's plan to merge the country's top two videogame streaming sites, Huya and DouYu , three people familiar with the matter told Reuters.
** China's main Shanghai Composite index closed down 0.11% at 3,530.26 points, while the blue-chip CSI300 index ended down 0.05%.
** Around the region, MSCI's Asia ex-Japan stock index was firmer by 0.06%, while Japan's Nikkei index closed up 0.16%.
** The yuan was quoted at 6.4628 per U.S. dollar at 08:22, 0.02% firmer than the previous close of 6.4639.
** At close, China's A-shares were trading at a premium of 39.53% over Hong Kong-listed H-shares.