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and causes phosphorylation of another molecule.
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This is - there are also other receptors
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that are linked to other enzymes besides kinases.
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I've included that as a general family here.
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So, these are receptors, for example,
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that bind the ligand and then liberate an enzyme
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which promotes some sort of reaction inside the cell,
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often it's kinases but doesn't have to be.
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One of the enzymes that often gets activated
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is an enzyme which converts ATP, a small molecule
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that is inside all of our cells.
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ATP is famous for its ability to store energy