Fig. 4. (  A ) Pyramidal cell layer of the CA1 subregion of a pig from the lung injury group showing a layer of shrunken, so-called dark neurons (  arrows ), whereas neighboring layers of neurons seem to be intact. (  B ) Parahippocampal region of the same pig representing disseminated dark neurons, focally accompanied by satellite cells (  arrow ) adjacent to intact neurons (  arrowhead ). (  C ) CA1 subregion of a pig from the hypoxia-only group showing intact neurons in the pyramidal cell layer.