New peptaibols, trichokindins I-VII, have been isolated from the fungus Trichoderma harzianum. Their structures were characterized by spectrometric methods. Trichokindins, which are 18-residue peptides containing one to three isovaline residues, were found to induce Ca(2+)-dependent catecholamine secretion from bovine adrenal medullary chromaffin cells.
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Iida et al. (1994) studied this question.