["Note that ～ら is used more like ～たち without pejorative connotations in Kansai-ben, though. And I think 彼ら is common even in standard speech, but you still wouldn't use it in reference to superiors.", "Oxygen (O2) is reduced by both enzymatic and nonenzymatic processes to the superoxide radical (O2-). This radical species of oxygen is postulated to be formed in vivo in animals through activity of some"]