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Differentiation of early-stage parkinsonisms using neuromelanin-sensitive magnetic resonance imaging

Systemically delivered drugs must cross the BBB, favoring small (under 500 Da) and lipophilic molecules for optimal absorption (Alqahtani et al., 2021), whereas IN delivery allows both small and large molecules, including peptides and proteins, to bypass the tightly sealed endothelial barriers and potentially reach the CNS directly

The restrictions inadvertently fueled a dangerous gray market, where patients turned to unregulated online vendors for research use only peptides, which carry a high risk of contamination, incorrect dosing, and impurities

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Abstract Beneficial bacterial symbionts are widespread in insects and affect the fitness of their hosts by contributing to nutrition, digestion, detoxification, communication or protection from abiotic stressors or natural enemies