the relationship between the brain and the immune system is:  a) bidirectional b) Unidirectional  c) A legend because it has not been proven scientifically    2) In response to viral infection, the immune cell starts releasing proteins to coordinate the immune system's response. These proteins:  a) Do not affect the brain because there is no connection between the immune system and the brain  b) Affect the brain, and cause depressive-like symptoms  c) Are unable to enter

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