Table 1.

Sequences used in the present phylogenetic analyses

Species	Accession nos.
Synechocystis sp. PCC6803	P10549
Synechococcus elongatus	P55221
Synechococcus sp. PCC7942	P11472
Cyanothece sp. ATCC51142	Q9R6W6
Nostoc sp. PCC7120	P13907
P. yezoensis	AV432153, AV432421,  AV432896, AV436570
H. triquetra	This study
H. akashiwo	K.-i.I., unpublished data
K. brevis	This study
I. galbana	This study
Euglena gracilis	BAA03529
Volvox carteri	Q9SBN6
Chlamydomonas reinhardtii	P12853
Pisum sativum	P14226
Arabidopsis thaliana	P23321
Spinacia oleracea	P12359
Fritillaria agrestis	O49079
Nicotiana tabacum	Q40459
Solanum tuberosum	P26320
Bruguiera gymnorrhiza	BAA96365
Triticum aestivum	P27665