MP2Lab latest research article in the framework of ERC project KleptoSlug has made the cover of the journal Biology Open with an image of the tropical sea slug Elysia crispata. This sea slug is capable of stealing functional chloroplasts – kleptoplasts – from its prey algae. The study looks into the influence of the spectral composition of light, reporting faster growth under red light and increased kleptoplast longevity under blue light. This trade-off is consistent with a higher degree of closure of the animal’s lateral folds (parapodia) observed under blue light that shields the kleptoplasts from light-induced damage, effectively extending their lifespan.