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Compare with the separate steps in ancestral reconstruction; model and substrate differences remain unresolved.\nexposure: COQ4 expression in deficient E. coli and non-CoQ-producing Corynebacterium\nevidence_span: {\"source_cache\": \"artifacts/coq10-research/38295803.abstract.txt\", \"locator\": \"Primary indexed abstract; zero-based, end-exclusive Unicode character offsets\", \"file_sha256\": \"82bbf9ebf67bcf7d7d22a428dc8d13f75a6210d75abea0e0fb40064d368a3dfb\", \"start_char\": 0, \"end_char\": 1019, \"text_sha256\": \"82bbf9ebf67bcf7d7d22a428dc8d13f75a6210d75abea0e0fb40064d368a3dfb\"}\n[coq10-p38295803] COQ4 is required for the oxidative decarboxylation of the C1 carbon of coenzyme Q in eukaryotic cells. 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