Table 2.

Structures and natural forms of human TFF peptides at their predominant expression sites.

TFFs	Structures	Expression Sites	Natural Forms (Major/Minor)
TFF1		Stomach	TFF1mono TFF1-FCGBP TFF1-X (60 k) TFF1-GKN2 TFF1-TFF1
TFF2		Stomach	TFF2/MUC6 TFF2
TFF3		Intestine, salivary glands	TFF3-FCGBP TFF3-TFF3 TFF3mono

Acidic residues flanking the C-terminal cysteines are shown in red. For TFF2, the N-linked carbohydrate moiety is depicted (yellow squares, GalNAc; blue squares, GlcNAc; green circles, Man; red triangles, Fuc). Major natural TFF forms are shown in bold.