Oxytocin
It has been shown that oxytocin differentially affects males and females. Females who are administered oxytocin are overall faster in responding to socially relevant stimuli than males who received oxytocin. Additionally, after the administration of oxytocin, females show increased amygdala activity in response to threatening scenes; however, males do not show increased amygdala activation. This phenomenon can be explained by looking at the role of gonadal hormones, specifically estrogen, which modulate the enhanced threat processing seen in females. Estrogen has been shown to stimulate the release of oxytocin from the hypothalamus and promote receptor binding in the amygdala.
Oxytetracycline
Oxytetracycline is also used to treat acne, due to its activity against the bacteria on the skin that cause acne ("Propionibacterium acnes"). It is used to treat flare-ups of chronic bronchitis, due to its activity against the bacteria usually responsible, "Haemophilus influenzae". Oxytetracycline may also be used to treat other rarer infections, such as those caused by a group of micro-organisms called rickettsiae ("e.g.", Q fever). To make sure the bacteria causing an infection are susceptible to it, a tissue sample is usually taken, for example a swab from the infected area, or a urine or blood sample.