concentration of acetylcholine at which the reduction in force during dilation of a blood vessel is half the maximum value (EC50) negative logarithm of the molar concentration of acetylcholine at which the reduction in force during dilation of a blood vessel is half the maximum value 2021-06-18T15:57:10Z A calculated value for the negative logarithm of the molar concentration of acetylcholine (ACh), which acts as a neurotransmitter, at which the dilation of a blood vessel in response to the application of ACh is half maximal. The logarithm of the concentration is the exponent indicating the power to which 10 must be raised to obtain that concentration value. ACh pD2 CMO:0003728 PMID:32088716 acetylcholine -Log EC50 acetylcholine -Log half maximal effective concentration (-Log EC50) clinical_measurement_ontology slaulede