Cellular pathology is not an end if one cannot see any alteration in the cell. Chemistry brings the clarification of living processes nearer than does anatomy. Each anatomical change must have been preceded by a chemical one.

attributed to Rudolph Virchow Coper, H., Herken, H., 1963. Dtsch. Med. Wochenschr. 88,2025– 2036. cited by 1. Gelman BB, Soukup VM, Schuenke KW, Keherly MJ, Holzer C, Richey FJ, et al. Acquired neuronal channelopathies in HIV-associated dementia. J Neuroimmunol. 2004;157(1–2 SPEC. ISS.):111–9.