1 Temperate highland tropical climate with dry winters (Cwb, Cwc) is a type of climate characteristic of the highlands inside the tropics of Mexico, Peru, Bolivia, Madagascar, Zambia, Zimbabwe and South Africa, but it is also found in central Argentina, outside the tropics.
Like the earwax glands, the mammary glands are also a form of the apocrine gland and express the ABCC11 gene. The C variant of ABCC11 associated with wet type earwax is also associated with colostrum secretion from the mammary glands (4).
While the populations of Europe and Africa have wet ear wax, those of East Asia have dry ear wax. Other populations are somewhere in between. Nature Genetics has the original paper (donât be surprised if the link takes a while to load). Here are the worldwide distribution of the alleles: