The page contains two contents:
General: this table lists the KO entries and their description specific to this pathway, and provides their frequencies in and in the whole dataset.
Profile + homologs: the distribution of the Kegg entries of Proximal tubule bicarbonate reclamation Kegg pathway is displayed here. Given a Kegg entry and a genome, a red box indicates that one or more loci have been annotated with, while a green box indicates that no locus/loci has(have) been annotated with it, but it/they is/are part of an Orthologous group in which other members have been annotated with that Kegg entry, so it is likely that this copy(ies) also performs this Kegg function.

Check the composition of the Proximal tubule bicarbonate reclamation pathway