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Nicotine is a paradox: it acutely sharpens attention via nicotinic receptors but dependence and withdrawal reliably fog memory and concentration and a 2024 Psychopharmacology review links e-cigarettes to impaired memory and decision-making even in never-smokers

Enzymatic Sensitivity and Matrix Remodeling Assays: Exploring enzyme regulation and extracellular structure behavior in controlled environments

D50.9 covers unspecified iron deficiency, the D50 family covers the causes, D64.9 is the temporary fallback, and the manifestation codes (D63.1, D63.8, D62) each carry sequencing rules that protect the claim

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