Genomic organization and phylogenetic analysis of the two forms of Rubisco of R. centenum. (A) The structural gene arrangement for Form IAq and IC of Rubisco found in R. centenum and Form II of Rubsico in R. rubrum are shown. Yellow indicates those genes encoding both large and small subunits of Rubisco and the Calvin cycle enzymes. Red indicates the cbb operon transcriptional regulator. (B) Maximum likelihood unrooted tree of Rubisco Form IAq, IAc, IB, and IC based on a multiple protein alignment. The two forms of Rubisco found in R. centenum are indicated red.