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In page Tungusic languages:

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There are some proposed sound correspondences for Tungusic languages. For example, Norman (1977) supports a Proto-Tungusic *t > Manchu s when followed by *j in the same stem, with any exceptions arising from loanwords.[3] Some linguists believe there are connections between the vowel harmony of Proto-Tungusic and some of the neighboring non-Tungusic languages. For example, there are proposals for an areal or genetic correspondence between the vowel harmonies of Proto-Korean, Proto-Mongolian, and Proto-Tungusic based on an original RTR harmony.[4] This is one of several competing proposals, and on the other hand, some reconstruct Proto-Tungusic without RTR harmony.[4]