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. 2010 Dec 8;214(4):933–939. doi: 10.1007/s00213-010-2103-5
Found concentration (ng/mL) Equivalent concentration in DMSO-PEG 400 (ng/mL)
Freshly prepared solution
 1. 915 3.66
 2. 915 3.66
Six-day-old solution
 1. 891 3.56
 2. 894 3.59