revealing nothing about the pathology it pretends to investigate 
(ROOT (S (VP (VBG revealing) (NP (NP (NN nothing)) (PP (IN about) (NP (NP (DT the) (NN pathology)) (SBAR (S (NP (PRP it)) (VP (VBZ pretends) (S (VP (TO to) (VP (VB investigate)))))))))))))
(ROOT (S (VP (VBG ) (NP (NP (NN )) (PP (IN ) (NP (NP (DT ) (NN )) (SBAR (S (NP (PRP )) (VP (VBZ ) (S (VP (TO ) (VP (VB )))))))))))))