By Levi Clancy for Student Reader on

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Mammalian galectins bind carbohydrates, preferring poly-N-acetyl lactosamine (Galβ1→4GlcNAcβ1).

The three structural groups are:
Proto galectin Galectin-1,2,5,7,10. Cross-link homologous carbohydrate ligands.
Chimera galectin Galectin-3. Cross-links carbohydrate and non-carbohydrate ligands.
Tandem repeat galectin Galectin-4,6,8,9. Cross-link two distinct carbohydrate ligands.