Refer to the figure.In an experiment to test the function of leptin in mice, parabiotic twins were created by surgically connecting the circulatory systems of a wild-type (WT) mouse with an obese mouse or a wild-type mouse.The obese mouse either lacked functional leptin (genotype ob/ob) or lacked the receptor for leptin (genotype db/db) .After allowing the mice to feed at will, they observed the results shown in the figure. 
It is most likely that
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