Figure 1. Activity profiles for CE (A) and PCE (B) with para-nitrophenylacetate (p-NPA), ortho-nitrophenylacetate (o-NPA), para-nitrophenylbutyrate (p-NPB), ortho-nitrophenylbutyrate (o-NPB), and butyrylthiocholine iodide (BTC). All data are reported as mean ± standard error. N = 3. Standard deviations for CE range from 0.01 to 0.16 units/µg protein, and for PCE from 0.0002 to 0.003 units/µg protein.