“…To build the human-clawed frog clock, we analyzed previously generated methylation data from n=1366 human tissue samples (adipose, blood, bone marrow, cerebellum, cortex, dermis, epidermis, embryonic cells, fibroblasts, heart, keratinocytes, kidney, liver, lung, lymph node, muscle, pituitary, placenta, skin, spleen) from individuals whose ages ranged from 0 to 101 years [51]. The tissue samples came from three sources.…”