C3 and schizophrenia: In schizophrenic patients’ induced pluripotent stem cell‐derived neural cell culture, C3 complement deposition was significantly positively correlated with the copy number of C4AL (long form of C4A), but not with the short or long copy number of C4B13, which indicates C3 is also involved in excessive microglial phagocytosis of synapses in schizophrenia.50