The inferred metabolism in Sulcia and Nasuia bacteriocytes. The inferred metabolism in Sulcia and Nasuia bacteriocytes. (A) Integrated nutrition pathways in Sulcia and Nasuia bacteriocytes. Relevant genes underlying precursor metabolites synthesized by the bacteria and host are shown. (B) The GS/GOGAT cycle for recycling NH3. More highly expressed host genes in bacteriocytes relative to body tissues are colored based on the genome they occur in and the log2 FC ratio. See inset legend for additional details and explanation of metabolite abbreviations. See text for full names of gene products. HTGs are shown in bold and labeled with an asterisk. Meng Mao et al. PNAS doi:10.1073/pnas.1811932115 ©2018 by National Academy of Sciences