2 daughter colonies of the 4a were tested:
DE-7-139-1091-2015 DE-7-139-1092-2015
2 tested queens were mated at the mating station:
DE-7-139-2006-2017 DE-7-139-2007-2017
3 daughter colonies of queens mated at the mating station were tested:
DE-7-139-1268-2019 DE-7-139-1269-2019 DE-7-139-1270-2019