Not exact matches
Since 1956, scientists have identified reward systems involving dopamine neurons in rats, dolphins, monkeys,
and humans,
among other mammals.
(Elephant protein sequences in present databases are incomplete, so
other matches for the mastodon turned up
among more distantly related
mammals, including dogs, cows, mice,
and humans.)
The impact on wild populations could be profound, they say,
and because the processes of reproductive development are remarkably well conserved
among mammals, these effects are very likely to be occurring
among other mammalian species, including
humans.
As much as dogs
and humans may have in common, from our lifestyles to our health, in
other ways dogs are unique
among mammals.