1 Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA, USA. Electronic address: seoa@janelia.hhmi.org.
2 Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Shenzhen, China; Institute of Biological and Environmental Science, University of Aberdeen, Aberdeen AB24 2TZ, UK. Electronic address: j.speakman@abdn.ac.uk.
3 Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK. Electronic address: colin.selman@glasgow.ac.uk.