This biological catalyst accelerates a reaction without being consumed.

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Your new ahaEnzyme

Enzymes speed reactions by lowering activation energy. Source: Enzyme ↗

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58This preparation trains immune responses against a pathogen or its products.RECALL
Vaccine
It creates immune memory
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59This endocrine messenger travels to target tissues to influence their activity.RECALL
Hormone
Insulin is one example
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60This junction lets a neuron communicate with another cell.RECALL
Synapse
Signals cross it using chemicals or electricity
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