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PE-22-28 comes from research on shortened versions of spadin.

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Its story begins with an ion channel called TREK-one.

3
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Scientists tested how these peptides affected channel activity, stability and behaviour in mice.

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Those experiments explored a possible route for antidepressant drug development.

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A change in a mouse behavioural test is not proof that a person’s depression will improve.

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It also cannot establish human brain exposure, long-term safety or comparative effectiveness.

7
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Use the phrase experimental candidate, and keep the evidence level visible.

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The research provides a hypothesis to test, not a replacement for established mental-health care.