histological , electron microscopy and morphological methods were used to study the structure of the thymus of wistar rats in the antenatal and early postnatal ontogenesis after administering to their mothers of the therapeutic doses of tetracycline hydrochloride at varying times of pregnancy ( days 1-6 , 8-13 , 14-19 ) .
C0546879
tetracycline hydrochloride
C0032961
pregnancy