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. 2022 Mar 22;131(1):157–170. doi: 10.1093/aob/mcac041

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Fig. 5. — Gene expression profiles for the caffeine biosynthetic pathway. Expression profiles for caffeine biosynthetic genes in C. arabica, C. canephora, and C. eugenioides (A), as well as allele-specific expression of C^a and E^a homeologue pairs in C. arabica (B). The x-axis represents seed developmental stages in chronological order and the y-axis represents the gene expression level as normalized read counts. DXMT1 (Cc01g00720), 3,7-dimethylxanthine methyltransferase (caffeine synthase); GSDA (Cc02g31500), guanosine deaminase; MXMT1 (Cc00g24720), 7-methylxanthine methyltransferase (theobromine synthase); NMN, N-methylnucleosidase; SAH, S-adenosyl-l-homocysteine; SAM, S-adenosyl-l-methionine; XMT1 (Cc09g06970), xanthosine methyltransferase.