Firms are now studying how genes interact, looking for correlations that might be used to determine the causes of disease or predict drug’s efficacy.
【句子分析】
单词短语：
interact：相互作用
correlation：关联
【句式结构】
Firms are now studying how genes interact, looking for correlations that might be used to determine the causes of disease or predict drug’s efficacy（定语从句）.
