they lack , however , any enzymatic activities for the formation of isopentenyl diphosphate via the mevalonate pathway , i.e . hydroxymethylglutaryl-coa reductase , mevalonate kinase , phosphomevalonate kinase and diphosphomevalonate decarboxylase , which are present and easily detectable within the endoplasmic reticulum and cytoplasm .
C0014239
endoplasmic reticulum
C0010834
cytoplasm