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Serine/threonine Kinase 33 (STK33) is expressed at high levels in testis and the fetal lung and heart, and at lower levels in a number of other tissues. However, STK33 is different form the other serine/threonine kinases in that it is not expressed in neural tissues. STK33 is thought to be involved in the phosphorylation of vimentin. Additionally, STK33 has been identified as a synthetic lethal in KRAS mutant lung cancers.