CD68-ir microglia in the hypothalamic arcuate nucleus of diet induced and monogenic obese mice. In comparison to iba1-ir, which stains both the soma and processes of microglia, CD68-ir is mainly visible inside the soma of the microglia. P < 0.05 for *: vs. WT SC group, ^^: vs. ob/ob SC group, §: vs. db/db SC group, ^: vs. db/db HFD group; scale bar = 100 μm.