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THE PRELIMINARY STUDY OF HOMOGENATE OF THE WHEEL ORGAN AND HATSCHEK'S PIT OF AMPHIOXUS ON TESTICULAR DEVELOPMENT IN YOUNG TOAD (BUFO MALANOSTICTUS)

FANG YOUNG-QIANG (The Third Oceanographic Institute,National Oceanographic Bureau,Xiamen) WANG LONG (Department of Biology,University of Shan Dong)  
The homogenate of the wheelorgan and Hatachek's pit of Amphioxusis subcutaneously injected into theyoung toad at a dose of 0.5 ml (con-taining 5 or 10 wheel organ and Hat-schick's pit of Amphioxus) for 3 or 7days.It causes a marked increaseof testicular weight of the young toadand promotes spermatogenesis acti-vity. The results obtained in this ex-periment indicate that:(1) the homogenate of the wheel organ andHatschek's pit of Amphioxus may contain gonadotrophin-like substance (s);(2) this substance seems to have nospecies specificity.
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