4 daughter colonies of the 4a were tested:
CH-51-7-2872-1988 CH-51-7-3089-1988 CH-51-7-3092-1988 CH-51-7-3143-1988
7 tested queens were mated at the mating station:
CH-51-7-3245-1990 CH-51-7-3246-1990 CH-51-7-3247-1990 CH-51-7-3248-1990 CH-51-7-3249-1990 CH-51-7-3250-1990 CH-51-7-3251-1990
8 daughter colonies of queens mated at the mating station were tested:
CH-51-7-3719-1991 CH-51-7-3720-1991 CH-51-7-3721-1991 CH-51-7-3722-1991 CH-51-7-3727-1991 CH-51-7-3728-1991 CH-51-7-3729-1991 CH-51-7-3730-1991