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Body mass as a percentage (± SEM) of initial values of hamsters bearing Mel- or beeswax-containing cannulas in the NRE, PVT, or SCN. On week 40 (arrow), all brain cannulas were filled with beeswax and animals infused s.c. with Mel for 6 wk. *, Significantly different from week 40 value for all groups (P ≤ 0.001).
