Heat maps illustrating significant differences in phenotype parameters between C57BL/6N and C57BL/6J male and female mice. Parameters were assessed from each of the four centers (Helmholtz Zentrum Munchen (HMGU), Institut Clinique Souris (ICS), MRC Harwell, and the Wellcome Trust Sanger Institute (WTSI)). Phenotype parameters that showed significant differences in two or more centers, but the opposite trend in another center. Parameter designations and parameter descriptions are from EMPReSSslim. Significance levels and the direction of the effect (red and green) are defined in the key.