Determine the missing factor. 
Definitions:
Regulatory Sequences
Segments of DNA that are involved in controlling the activity of genes, including when, where, and how much of a gene product is made.
Constitutive
Expressed continuously under normal physiological conditions, not subject to regulation by environmental conditions.
Lac Operon
A set of genes involved in the metabolism of lactose in bacteria, along with their promoter and operator sequences that control their expression.
Repressor Protein
A type of protein that binds to specific DNA sequences and inhibits the expression of a gene by blocking RNA polymerase.
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