Examlex
The water-soluble hormones cannot pass through the plasma membrane;they must rely on ______ messengers within their target cells to mediate their action.
Transcription Factors
Proteins that help regulate the expression of genes by binding to specific DNA sequences near genes.
Positional Information
The spatial and temporal cues that cells use during development to differentiate into the correct cell types and form complex structures.
Meganeura
An extinct genus of insects from the Carboniferous period, known to include some of the largest known flying insect species.
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