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target cells
Well Wiki say "A hormone (from Greek ὁρμή - "impetus") is a chemical released by a cell in one part of the body that sends out messages that affect cells in other parts of the organism." So a hormone knows where to go because that's where the signal is coming from.
Receptors on the cell that the virus can attach to.
called receptor tyrosine-kinases
attach to specific transport proteins
Viruses have to attach them selves by way of a protein called a recognition factor. They bind to receptors on the host cell and then lose their capsid (coat).
uncategorized
Neurotransmitters attach to proteins with sugars attached. The receptors then tell the molecules what to do and where to go in the cell.
target cells
Well Wiki say "A hormone (from Greek ὁρμή - "impetus") is a chemical released by a cell in one part of the body that sends out messages that affect cells in other parts of the organism." So a hormone knows where to go because that's where the signal is coming from.
Receptors on the cell that the virus can attach to.
called receptor tyrosine-kinases
The membrane proteins that attach to specific hormones such as insulin are called receptor proteins.
receptor molecules in the cell membrane
attach to specific transport proteins
Tendons attach muscles to bones.
receptor molecules in the cell membrane