NTRK1 and myocardial infarction: Pre-clinical researches (Li et al., 2015a,b) indicated that LXNX formula decreased tyrosine hydroxylase (TH) mRNA, acetylcholinesterase (AchE) mRNA, nerve growth factor (NGF) mRNA, and tyrosine kinase receptor A (TrKA) mRNA in previous test subjects, mice with myocardial infarction.