TABLE 1.

Synechococcus strains used in this study and some of their characteristics

Strain	Geographic region of isolation	PUB/PEB ratioa	Source	Motility
E. Lake	Freshwater (Yosemite National Park)	No PUB	B. Palenikb	−
WH7803	Atlantic Ocean	0.4	J. Waterburyc	−
WH7805	Atlantic Ocean	No PUB	J. Waterburyc	−
WH8011	Atlantic Ocean	0.8	J. Waterburyc	+
WH8102	Atlantic Ocean	2.0	J. Waterburyc	+
WH8103	Atlantic Ocean	1.2	J. Waterburyc	+
WH8112	Atlantic Ocean	1.1	J. Waterburyc	+
WH8113	Atlantic Ocean	1.0	J. Waterburyc	+
CC9301d	California Current	2.0	B. Brahamsha	+
CC9702	California Current	1.6	This study	+
CC9703	California Current	0.4	This study	+
C129	Red Sea	0.9	A. Post and D. Lindell	+

^aRatio of the peaks observed in the fluorescence excitation spectra when emission was measured at 570 nm. These peaks corresponded to PUB and PEB peaks at approximately 495 and 545 nm, respectively. 

^bSee reference 25. 

^cSee reference 33. 

^dThis strain has been designated mot2 previously (30).