Table 3.

Additional domains of cyanobacterial MCA Gene

Abbreviation	Domain	Functions	Distribution
ANF-receptor	ANF-receptor	extracellular ligand binding domain	transmembrane receptors (such as histidine kinases, serine/threonine kinases)
CHASE2	CHASE2	extracellular sensory in signal transduction	transmembrane receptors (such as histidine kinases, serine/threonine kinases)
DEXDc	DEAD-like helicases superfamily	ATP-binding	proteins involved in ATP-dependent RNA or DNA unwinding
DUF323	Domain of unknown function	unknown	bacterial unknown proteins
EZ HEAT	E-Z type HEAT repeats	scaffold	cyanobacterial phycocyanin lyase and other proteins
GUN4	GUN4-like domain	signaling; accumulation of glycolipids into the heterocysts	cyanobacterial serine/threonine kinases
NACHT	NACHT domain	programmed cell death	apoptotic proteins
WD40	WD40 domain	regulator in signal transduction	cyanobacterial serine/threonine kinases
pentapeptide	pentapeptide repeats	accumulation of glycolipids into the heterocysts	unicellular and filamentous cyanobacterial proteins