We are interested in detecting nerve growth/sprouting in porcine heart after myocardial infarction and tried one antibody to GAP43 (Novus). Unfortunately this antibody stained all cardiac nerves even in control hearts. Others have told me they have the same problem in mouse heart. Is GAP43 not a specific target or is this just an antibody problem? Others have recommended 2G13 protein as an alternative marker. Any suggestions would be appreciated.