of their first full flush of testosterone 
(ROOT (PP (IN of) (NP (NP (PRP$ their) (JJ first) (JJ full) (NN flush)) (PP (IN of) (NP (NN testosterone))))))
(ROOT (PP (IN ) (NP (NP (PRP$ ) (JJ ) (JJ ) (NN )) (PP (IN ) (NP (NN ))))))