3.2.1.183 - 3.2.1.183 neuC gene is cloned into an intein expression vector 3.2.1.183 purification from Escherichia coli results in 100 microgram/l pure and structurally intact protein. For insect cells, purification methods are established which result in up to 50 mg/l pure, soluble, and active protein 3.2.1.183 using a single ion exchange chromatographic step. The resulting protein is estimated to be 80% pure 3.2.1.183 using salmine sulfate precipitation and chromatography on phenyl-Sepharose, ATP-agarose, and Mono Q