 This research revealed some degree of adult neurogenesis in the hippocampus and olfactory bulb of rats, and paved the way for the possibility of neuropoiesis in the adult mammalian brain.Following Altman's work, thymidine-H3 injections were used to examine the brains of a variety of other species.In the late 1970s Steven Goldman used this technique to examine the vocal control centers of songbirds, and he found widespread evidence of adult neurogenesis in this area of a canary's brain.