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An estimation of the detection threshold for androstadienone (Steraloids Inc., Newport, RI, USA) was obtained for each participant with a three-alternative forced-choice detection test consisting of six concentrations of androstadienone dissolved in propylene glycol (10 mM, 1 mM, 0.1 mM, 0.001 mM, 0.0001 mM, 0.00001 mM), with one of the three glass jars containing androstadienone and the other two the solvent, propylene glycol (Fluka, Sigma-Aldrich Chemie Gmbh, Munich, Germany).
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