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The upregulation of BDNF signaling in animal models appears to improve the survival of dopaminergic neurons when given prior to PD induction or result in partial restoration of dopaminergic transmission [230]

Development of a vaccine based on bacteria-mimicking tumor cells coated with novel engineered toll-like receptor 2 ligands

IL-18 acts in synergy with IL-12 to stimulate T cells production of IFN-, which in turn stimulates synovial macrophages to produce TNF- and IL-1, leading to joint inflammation and cartilage destruction (79)

While this sample size may seem small, it is not unusual for crossover studies, where each participant serves as their control, allowing for more robust within-subject comparisons despite a smaller overall sample

This just means penetration is slow and most of the action is happening on the surface