She notes that there are other studies underway to figure out the
receptors in the brain that are affected by stimuli
like the
odor of androstadienone, which could help determine the reason for the corresponding hormone hikes.
Each
odor - detecting neuron (referred to as olfactory sensory neuron from here on), chooses a single odorant
receptor gene from a fairly large number of options that are split into class I (fish -
like) and class II (terrestrial - specific) odorant
receptors.