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The endothelin‐1 immunoreactivity in astrocytes and neurons was expressed as scores and calculated by summation of the grades of number and intensity (eg, ET‐1 immunoreactivity in astrocytes = grade “number of positively stained astrocytes” + grade “intensity of astrocytic staining”). These scores were used for further statistics. * Only 28 cases with present neurons on cross section are included.
