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Hartmann J, Erb C, Ebert U, Baumann KH, Popp A, König G, Klein J.Hartmann J, et al. Among authors: klein j.Neuroscience. 2004;125(4):1009-17. doi: 10.1016/j.neuroscience.2004.02.038.Neuroscience. 2004.PMID: 15120860
Erb C, Klein J, Köppen A, Löffelholz K, Jeltsch H, Cassel JC.Erb C, et al. Among authors: klein j.Neurosci Lett. 1997 Aug 1;231(1):5-8. doi: 10.1016/s0304-3940(97)00504-1.Neurosci Lett. 1997.PMID: 9280154
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Hilgert M, Hartmann J, Löffelholz K, Jeltsch H, Cassel JC, Klein J.Hilgert M, et al. Among authors: klein j.Neurochem Res. 2003 Apr;28(3-4):467-72. doi: 10.1023/a:1022852819018.Neurochem Res. 2003.PMID: 12675132
Kiewert C, Buchholzer ML, Hartmann J, Chatterjee SS, Klein J.Kiewert C, et al. Among authors: klein j.Neurosci Lett. 2004 Jul 8;364(3):195-8. doi: 10.1016/j.neulet.2004.04.046.Neurosci Lett. 2004.PMID: 15196674