SERPINA2 and keratoconus: Specifically, the abundance of several ARGs belonging to aminoglycoside (aadA, aadE, ant(9)-I), bacitracin (bacA), MLS (ermA, ermB, ermG, lsa, macB), tetracycline (tet40), and vancomycin (vanG, vanS) (Fig. 4d) classes in KC were lower than in AN or CH.