The mechanisms of transcriptional regulation of the Halloween genes appear to differ from one another.

Descriptions

The spook gene (Cyp307a1) is expressed in the prothoracic gland, and in conjunction with the gene product of spookier (Cyp307a2), converts 7-dehydrocholesterol to ?⁴-diketol.

The phantom gene (Cyp306a1) encodes an encoding the microsomal 25-hydroxylase. Strong expression of

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