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As we exercise, we burn more calories, and when we eat fewer calories, we lose weight

In situ T-cell transfection by anti-CD3-conjugated lipid nanoparticles leads to T-cell activation, migration, and phenotypic shift

But that burst is a one-time event -- the growth factors are released over days, and then the stimulus fades until your next session 4-6 weeks later

Int J Radiat Oncol Biol Physics

Riggs, D

Nature , 288(5792), 715717