Before revision:  The non-heme iron at the reaction center, the toroidal shape of the light harvestor , the functional role played by the long-lasting spectrometric signal observed, and the photon anti-bunching observed suggest non-reciprocity. Our model has the required structural information automatically built in. We further comment about how our prediction might be verified experimentally{\it  {\it   .
After revision:  The non-heme iron at the reaction center, the toroidal shape of the light harvestor , the functional role played by the long-lasting spectrometric signal observed, and the photon anti-bunching observed . Based on these analyses, two mechanisms might be used by radiation-durable bacteria,{\it {\it .