Table 2.

Ultrastructural localisation of complement components and regulatory proteins on the cell membrane of gastric cells

	Localisation on gastric cells
Complement components and regulatory proteins	Basal membrane	Lateral membrane	Luminal membrane
Uninvolved mucosa (n=3)
C3d	++	−	−
C5b–9	+	−	−
MCP (CD46)	++	++	−
DAF (CD55)	−	−	+
S protein	++	−	−
Protectin (CD59)	+	−	+
Differentiated adenocarcinoma (n=3)
C3d	++	−	+
C5b–9	+	−	±
MCP (CD46)	++	++	−
DAF (CD55)	−	+	++
S protein	++	−	±
Protectin (CD59)	++	+	++
Undifferentiated adenocarcinoma (n=1)
C3d	−
C5b–9	−
MCP (CD46)	++ (circumferential cell membrane staining)
DAF (CD55)	++ (circumferential and/or luminal cell membrane staining)
S protein	−
Protectin (CD59)	−

DAF, decay accelerating factor; MCP, membrane cofactor protein; −, negative; ±; occasionally positive; +, weakly positive; ++, strongly positive.