Table 1: Occurrence of oligo/polysialic acid-containing glycoproteins
Structure	DP	Occurrence	Carrier protein	Linkage
	2-3	egg surface complex from sea urchin	sperm receptor	O-linked
	2-40	egg jelly from sea urchin	polySia-gp	O-linked
	2-25	salmonid fish eggs	PSGP	O-linked
	2-7	ovarian fluid of rainbow trout	KDN-gp	O-linked
	2	ovarian fluid of rainbow trout	n.d.	N-linked
	-100	vertabrate embryonic brain	N-CAM	N-linked
	2-5	pig brain	n.d.	N-linked
	2	pig spleen	n.d.	N-linked
	>11	eel, rat brain	Na+-channel	N-linked
	2	human erythrocyte	band-3	N-linked
	2	human erythrocyte	glycophorin	O-linked
	-55	human tumors	N-CAM	N-linked
	2	human teratocarcinoma	n.d.	N-linked
n.d. not determined
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Table 2: Tissue distribution of three types of alpha 2 -> 8-sialyltransferases involved in formation of alpha 2 -> 8-linked sialic acid residue on glycoproteins
	ST8Sia II (STX)	ST8Sia III	ST8Sia IV (PST)
	brain (embryo) lung testis	brain (embryo) brain (adult) heart lung testis	brain (embryo) brain (adult) heart lung spleen testis
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