Shares in AbbVie have slumped after a pair of failed phase 2 trials for emraclidine, a schizophrenia drug it acquired as part of its $8.7 billion takeover of Cerevel Therapeutics last year.

Neurocrine's drug acts as a muscarinic M4 selective agonist, while KarXT targets M1 and M4 receptors and emraclidine is described as a muscarinic M4 receptor-positive allosteric modulator (PAM).

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