Shuffling the cards in signal transduction: Calcium, arachidonic acid and mechanosensitivity

Table 1 Properties of phospholipase A2 groups[36,41,43,45,46,54,55,85]

Group	Location	Size (kDa)	Common sources	Calcium requirement
I	Secreted	13-15	Cobra, human	mmol/L
II	Secreted	13-15	Viper, mouse, human	mmol/L
III	Secreted	16-18	Bee, lizard, scorpion, human	mmol/L
IV	Cytosolic	85	Human	< μmol/L
V	Secreted	14	Human	No
VI	Cytosolic	80-85	Human	No
VII	Cytosolic	40	Human, bovine	No
	Secreted	45	Human, bovine	No
VIII	Cytosolic	29	Human	No
IX	Secreted	14	Marine snail	< mmol/L
X	Secreted	14	Human	mmol/L
XI	Secreted	12-13	Green rice	mmol/L
Other	Secreted	14-15	Streptomyces (Bacteria)	mmol/L
	Cytosolic	93	Sporothrix schenckii (Fungi)	< μmol/L
	Secreted	10	Parvovirus	mmol/L