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Number of NADPH-d-positive ganglia per mm2 in 7-d-old, 15-d-old, and adult chickens in different segments of the intestine
Data are expressed as mean±SD (n=5). Superscripts above the bars represent the comparison between the numbers of NADPH-d-positive neurons per mm2 in same segment of different age groups. Different letters mean the difference was significant (P<0.05)
