 In addition, kelch repeats have been recognised in alpha- and beta-scruin, in galactose oxidase from the fungus "Dactylium dendroides" and in the "Escherichia coli" NanM protein, that is a sialic acid mutarotase.The structure of galactose oxidase reveals that the repeated Kelch sequence motif corresponds to a 4-stranded anti-parallel beta-sheet motif that forms the repeat unit in a super-barrel structural fold commonly known as a beta propeller.The known functions of kelch-containing proteins are diverse