Divergence of the Nannochloropsis chloroplast Clp orthologs. ClpC contains several conserved domains: an N-domain (green), a D1-domain (yellow), a middle domain (M, purple), and a D2-domain (blue). The D1 and D2 domains each contain an AAA module (red). The D-2 domain in Bacillus contains a conserved ClpP-binding loop (P, orange). Homologous structural and functional features identified between bacterial ClpC and translated Nannochloroposis Clp orthologs are color matched. The question marks indicate that the M-domain and ClpC-binding regions were not clearly identified.