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Plain-English explainers on peptide fundamentals: amino acids, structure, receptors, stability and how peptides are made.
How slow type I and fast IIa and IIx muscle fibres differ, why human 'IIb' fibres are really IIx, how motor units are recruited, and what genetics, training and aging change.
What myokines are, how IL-6 became the first, why the irisin hormone is still disputed, how myostatin brakes muscle, why FGF21 is a liver signal, and why myokines are hard to measure.
How tendons are built, tendon vs ligament, acute rupture versus tendinopathy, the three phases of tendon repair, why it is so slow, and what peptide research has and has not found.
What inflammatory mediators are, how histamine, bradykinin, prostaglandins and cytokines produce the cardinal signs, how resolution works and how the mediators are measured.
What glutathione is, how cells make, recycle and break it down, how laboratories measure it, and what oral and liposomal glutathione trials actually found.
ACTH explained: the 39-residue pituitary peptide cut from POMC, how CRH, vasopressin and cortisol feedback control it, how MC2R and MRAP drive cortisol, and where Semax fits.
What makes a medicine a peptide drug, how many are approved, how insulin, octreotide and the GLP-1 drugs were engineered and made, and how they differ from research peptides.
The 28 types of collagen by family, where types I to V are found, how collagen synthesis works step by step, the inherited collagen disorders, and what collagen peptide research shows.
How the hair growth cycle works: anagen, catagen, telogen, exogen and kenogen, the dermal papilla, the signals behind each phase, and what peptide studies in cells and mice show.
How skin wounds close: hemostasis, inflammation, granulation tissue and remodelling, why chronic wounds stall, how tissue repair is studied, and what peptide research shows.
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