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As a result of the Black Death,
Molecular Switch
A molecular mechanism wherein a molecule changes its structure in response to environmental signals, leading to a functional change.
Gene Expression
The process by which information from a gene is used to synthesize functional gene products (often proteins) that can affect a cell's structure and function.
Promoter
The nucleotide sequence in DNA to which RNA polymerase attaches to begin transcription.
Labeled
Marked with identifiers or tags for ease of identification or explanation.