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Fig. 3 | The Journal of Headache and Pain

Fig. 3

From: Brain-derived neurotrophic factor in primary headaches

Fig. 3

a Elevated serum levels of brain-derived neurotrophic factor (BDNF) inside (IB) and outside cluster bouts (OB). b Paired samples of cluster headache patients (n = 14) show a similar distribution with a significant elevation of BDNF levels in and out cluster bouts compared with controls

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