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Llewellyn-Smith, Ida J., Greta J. E. Gnanamanickam, Frank Reimann, Fiona M. Gribble, und Stefan Trapp. "PREPROGLUCAGON (PPG) NEURONS INNERVATE NEUROCHEMICALLY IDENTIFIED AUTONOMIC NEURONS IN THE MOUSE BRAINSTEM." Neuroscience 2012.

Llewellyn-Smith, Ida J., et al. "PREPROGLUCAGON (PPG) NEURONS INNERVATE NEUROCHEMICALLY IDENTIFIED AUTONOMIC NEURONS IN THE MOUSE BRAINSTEM." Neuroscience 2012.