Copy numbers of selected Pfam domains with potential roles as light-driven proton pumps, in carbon fixation, in photosynthesis and in diverse substrate transport processes. Filled stars and circles specify observed modes of transmission of the respective Pfam-domain-containing proteins. Stars represent recent HGTs from either eukaryotes or bacteria; circles indicate vertical transmission after ancient HGT or gene birth in the NCLDV; a darker colour indicates the predominantly observed mode of transmission (five or more events). The stacked bars on the right side of the heat map show, for each observed protein domain, the proportional distribution across different habitat types. Bars on the far right indicate the total number of observations for each protein domain.