BDNF and memory impairment: Dysregulation of BDNF levels or signalling, decrease of synaptogenesis and alterations in neuronal network formation and function represent common KEs described in different DNT-relevant AOPs, all leading to learning and memory impairment in children [[10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27]].