Benzylisoquinoline alkaloids (BIAs) are a kind of secondary metabolites which have important research and pharmaceutical value. Norcoclaurine synthase (NCS) plays an important role in the synthetic process of many BIAs. To investigate the role of this gene participates in synthesis of BIAs, we download the NCS gene from other species and compared the sequence with M. cordata transcriptome database and screened a candidate NCS gene from M. cordata. Then we used bioinformatics tools to analyze the sequence. We cloned the full length of its ORF region. Furthermore, we found that the tissue specif...