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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Immunolocalization of clavanins in Styela clava hemocytes.

Antimicrobial peptides play an important role in innate host defenses against infection. Clavanins are histidine-rich, amidated, 23-residue alpha-helical antimicrobial peptides that were isolated from a mixed population of Styela clava hemocytes. To learn which types of hemocytes contained clavanins, we raised a polyclonal antibody that recognized five different clavanins, and used it to localize these peptides by light and electron microscopy. Clavanins were present in the cytoplasmic granules and/or cytoplasm of five different types of granulocytes and they also occurred throughout the cytoplasm of macrophages. The orange G component of Mallory's trichrome stain had a high affinity for clavanins, and for the cytoplasmic granules of S. clava's hemocytes. Semiquantitative analysis of acid urea-PAGE gels suggested that clavanins and styelins comprised between 10 and 20% of the total cellular protein of eosinophilic granulocytes. Orange G and the century-old trichrome stain may provide simple screening tools for identifying cells that contain large amounts of antimicrobial peptides in mixed hemocyte populations.[1]


  1. Immunolocalization of clavanins in Styela clava hemocytes. Menzel, L.P., Lee, I.H., Sjostrand, B., Lehrer, R.I. Dev. Comp. Immunol. (2002) [Pubmed]
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