Arabinogalactan endo-β-1,4-galactanase (, endo-1,4-β-galactanase, galactanase, arabinogalactanase, ganB (gene)) is an enzyme with systematic name arabinogalactan 4-β-D-galactanohydrolase. It specifically catalyses the hydrolysis (1→4)-β-D-galactosidic linkages in type I arabinogalactans.

It is isolated from the bacterium Bacillus subtilis.

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