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<p>activation, and <a href="page.php?w=opsonin">opsonin</a> promotion of <a href="page.php?w=phagocytosis">phagocytosis</a> and pathogen elimination.</p>

<p><big>History</big></p>
<p>The concept of humoral immunity developed based on the analysis of <a href="page.php?w=antibacterial">antibacterial</a> activity of the serum components. <a href="page.php?w=Hans_Buchner_%28biologist%29">Hans Buchner</a> is credited with the development of the humoral theory. In 1890, Buchner described alexins as "protective substances" that exist in the <a href="page.php?w=serum_%28blood%29">blood serum</a></p><p>
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