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Believed to have been brought to Britain by the Romans, daffodils are a source of galantamine, a treatment for Alzheimer's disease.

Galantamine is a common medication used by people with Alzheimer's disease and other forms of dementia around the world to treat their symptoms.

In a paper in Nature Communications, researchers outline a process using genetically modified bacteria to create a chemical precursor of galantamine as a byproduct of the microbe's normal cellular metabolism.

The research team genetically modified E. coli to produce 4-O'Methyl-norbelladine, a chemical building block of galantamine.

The main drugs prescribed to people with early stage memory loss — donepezil, rivastigmine and galantamine — promote cholinergic signalling by inhibiting acetylcholine degradation to maintain its levels in the extracellular space119, which is thought to promote neuronal activity and improve cholinergic tone.