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10.1016/j.neuron.2019.05.035 Neuron 88 KimonoD.SarkarS.AlbadraniM.SethR.BoseD.MondalA.et al (2019)

Querol L, De Sze J, Dysgaard T, Levine T, Rao TH, Rivner M, et al

Regulation of innate immune responses in the brain

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the exact window depends on the product and diluent

I think they have good rationale for doing that