Novel object test of restricted interests in weanling TPH2−/− mice.

(A) latency to first investigate, (B) total number of contacts and (C) total time investigating a novel object. Data are presented as mean ± standard errors of the mean and are based on 20 TPH2−/− mice (10 males, 10 females) and 22 WT controls (11 males, 11 females). The main effect of sex was not significant so data for males and females is combined. Symbols indicate significant differences from WT controls. ** p<0.01.