TABLE 2.

Summary of ELP types in symbiotic cyanobacteria

ELP	Predicted interaction(s)	Interaction with host cells/tissue	Result for ELP types:
			“Ca. Synechococcus feldmannii” (n = 3)	“Ca. Synechococcus spongiarum” (n = 6)
Ankyrin	Avoidance of host predation	Archaeocyte	277cV	All genomes
LRR	Host specific	Unknown	All genomes	4 genomes (except 15L and M9)
TPR	Host specific	Unknown	Not enriched	Enriched in SP3
Rhamnose-free O antigen	Avoidance of host predation and phage resistance	Archaeocyte	277cV and 288cV	Absent
Cadherin	Adhesion to host cells	Unknown	Enriched in 277cV and 288cV	Enriched in DE9115
FN3a	Binding to host integrins and possible colonization	Extracellular matrix	277cV and 288cV	5 genomes (except M9)

^aThere were 3 to 11 FN3 proteins per genome (18 to 80 FN3 domains per genome) for “Ca. Synechococcus feldmannii” and 2 to 5 FN3 proteins per genome (2 to 12 FN3 domains per genome) for “Ca. Synechococcus spongiarum.”