A nucleic acid sequence including a CYP promoter operably linked to nucleic acid encoding a heterologous protein is provided to increase transcription of the nucleic acid. A central processing unit may cache instructions in a cache from a page of primary code stored in a memory storage unit. Under the direction of a control circuit, the passgates pass selected rising edges of the true clock signal, and selected falling edges of the complement clock signal, to an output clock terminal of the DFS circuit.