精准医疗板块2月26日跌0.4%，华大基因领跌，主力资金净流出5.12亿元

Group 1 - The core point of the article indicates that the precision medicine sector experienced a decline of 0.4% on February 26, with BGI Genomics leading the drop [1] - The Shanghai Composite Index closed at 4146.63, down 0.01%, while the Shenzhen Component Index closed at 14503.79, up 0.19% [1] - The precision medicine sector saw a net outflow of 512 million yuan from major funds, while retail investors contributed a net inflow of 325 million yuan [1] Group 2 - The article provides a summary of the fund flow within the precision medicine sector, highlighting a net inflow of 187 million yuan from speculative funds [1] - Detailed fund flow data for individual stocks in the precision medicine sector is mentioned, although specific stock details are not provided in the summary [1]