Helena A D Johard, Taishi Yoishii, Heinrich Dircksen, Paola Cusumano, Francois Rouyer, Charlotte Helfrich-Förster, Dick R Nässel. 2009. Peptidergic clock neurons in Drosophila - ion transport peptide and short neuropeptide F in subsets of dorsal and ventral lateral neurons. Journal of Comparative Neurology 516: 59-73.

Dick Nässel, Lina Enell, Jonathan Santos, Christian Wegener, Helena Johard. 2008. A large population of diverse neurons in the Drosophila central nervous system expresses short neuropeptide F, suggesting multiple distributed peptide functions. BMC neuroscience (Online) 9: 90-125.

Helena Johard, Lina Enell, Elisabeth Gustafsson, Pierre Trifilieff, Jan Veenstra, Dick Nässel. 2008. Intrinsic neurons of Drosophila mushroom bodies express short neuropeptide F: - relations to extrinsic neurons expressing different neurotransmitters. Journal of Comparative Neurology 507: 1479-96.