Primates include rhesus macaque and Hanuman langur. Rhesus e and rhesus C hemolytic disease of the newborn are rare. Parallel bottlenecks were proposed to exist among chimpanzees, gorillas, rhesus macaques, orangutans and tigers. After the rhesus macaque genome was sequenced, three genes could be compared. There is a considerable risk of monkey B virus from rhesus macaques. The rhesus macaque has 21 pairs of chromosomes. Several Chinese subspecies of rhesus macaques were described between 1867 and 1917. Research is primarily performed in non-human primates such as the rhesus macaque. Menopause has been observed in several species of nonhuman primates, including rhesus monkeys and chimpanzees. It is also safe for rhesus macaques, horses and rats. Manson and Parry found that free-ranging rhesus macaques avoid inbreeding. The rhesus macaque is well known to science. SV40 is dormant and is asymptomatic in rhesus monkeys. This exclusivity has only been shown in golden hamsters and the rhesus monkey. The Rhesus factor was discovered in 1937.