Perturbations of some of these neurodevelopmental processes (i.e., brain derived neurotrophic factor (BDNF) levels, synaptogenesis and neuronal network formation and function) are described as common key events (CKEs) in an adverse outcome pathway (AOP) network for human neurotoxicity [9] that leads to the same adverse outcome (AO) (i.e., learning and memory impairment in children) [[10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27]]. The gene discussed is BDNF; the disease is memory impairment.