20 daughter colonies of the 4a were tested:
DE-2-278-46-2016 DE-2-278-48-2016 DE-2-278-49-2016 DE-2-278-51-2016 DE-2-278-52-2016 DE-2-278-53-2016 DE-7-181-100-2016 DE-7-181-101-2016 DE-7-181-107-2016 DE-7-181-108-2016 DE-7-181-109-2016 DE-7-181-110-2016 DE-7-181-161-2016 DE-7-181-167-2016 DE-19-119-3416-2016 DE-19-119-3516-2016 DE-19-119-3616-2016 DE-19-119-3716-2016 DE-19-119-3816-2016 DE-19-119-3916-2016
7 tested queens were mated at the mating station:
DE-7-200-9-2017 DE-7-200-14-2017 DE-9-13-18-2017 DE-9-13-21-2017 DE-9-13-35-2017 DE-9-13-41-2017 DE-9-13-49-2017
8 daughter colonies of queens mated at the mating station were tested:
DE-9-13-16-2019 DE-9-13-18-2019 DE-9-13-19-2019 DE-9-13-21-2019 DE-9-13-22-2019 DE-9-13-23-2019 DE-9-13-24-2019 DE-9-13-25-2019