Fig. 2

Testosterone levels. a Serum testosterone levels in WT and Mras ^−/− males (WT, n = 26; Mras ^−/−, n = 31). b Total testosterone per mg testis tissue in WT and Mras ^−/− males (WT, n = 14; Mras ^−/−, n = 19). c Serum testosterone in aggressive (n = 9) and non-aggressive (n = 10) Mras ^−/− males. All data is from six month-old males and shown with SD. a–c There were no significant differences in testosterone levels between WT and Mras ^−/− samples