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A fairly detailed 2012 review (Whittaker et al.) on the Mechanisms of Coronavirus Cell Entry Mediated by the Viral Spike Protein noted that

SARS-CoV-like viruses have been isolated in bats. In this case, entry does not occur via ACE2 and their receptor(s) is/are unknown; however, replacement of the amino acid sequence found between residues 323 and 505 with the corresponding sequence of the SARS-CoV RBD is sufficient to allow human ACE2 receptor usage [46].

Is the actual (bat) receptor that allows SARS-CoV-like viruses to replicate in bats still unknown?

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