in the brain no correlation was found between the number of 125i-bhsp binding sites and the amount of substance p levels ( substance p-like immunoreactivity ) in synaptosomes , particularly in the hippocampus and the substantia nigra since the former structure was characterized by its low substance p content and its high number of binding sites and the reverse was observed in the substantia nigra .
C0006104
brain
C0038590
substantia nigra