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<p><a href="page.php?w=Active_transport">Active transport</a>ers use ATP to convert the energy in ATP into potential energy in the form of a concentration gradient. They use the ATP to transport an ion from a low concentration to a higher concentration. Examples of proteins that use ATP are <a href="page.php?w=P-type_ATPase">P-type ATPase</a>s that transfer Na<sup>+</sup>, K<sup>+</sup>, and Ca<sup>2+</sup> ions by phosphorylation, A-type ATPases that transfer anions, and <a href="page.php?w=ATP-binding_cassette_transporter">ABC transporters</a> (ATP</p><p>
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