Table 1.

Percentages of sequence identities (upper right triangle) and sequence similarities (lower left triangle) between the different Pcb proteins from Prochlorococcus MED4 (M-PcbA) and SS120 (S-PcbA to S-PcbG)

	M-PcbA	S-PcbA	S-PcbB	S-PcbC	S-PcbD	S-PcbE	S-PcbF	S-PcbG
M-PcbA	—	75	64	63	63	63	57	54
S-PcbA	87	—	71	66	66	66	61	58
S-PcbB	77	80	—	61	70	71	65	56
S-PcbC	78	79	73	—	56	57	53	66
S-PcbD	77	80	80	70	—	66	67	55
S-PcbE	78	80	79	71	78	—	57	55
S-PcbF	74	76	76	68	80	71	—	50
S-PcbG	72	75	70	80	71	71	68	—

^*Sequence similarities comprise identical sequences plus conservative substitutions within the groups DN, EQ, ST, KR, FYW, and LIVM.