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Summary: Cholecystokinin (CCK) is the most abundant neuropeptide that broadly regulates the physiological status of animals. Here, we present a two-color laser theta burst stimulation (L-TBS) protocol for simultaneous activation of Schaffer collateral and perforant pathway in the hippocampus of CCK Cre mice. We describe steps for heterosynaptic long-term potentiation induction by L-TBS. This technique allows for the examination of the neurotransmitter roles in synaptic modulation and facilitates the exploration of pathological mechanisms in genetic models of brain disorders in mice.For complete details on the use and execution of this protocol, please refer to Su et al.1 : Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics.