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Small, hydrophobic signaling molecules are transported in the blood __________________ binding proteins, and tend to act on receptors located ____________.
without; on the cell surface
attached to; on the cell surface
without; inside the cell
attached to; inside the cell
Which of the following are specialized types of signaling cell that control of the physiology and behavior of an organism as a whole (i.e. long-range and integrated pathways)?
None of these