( These ( ( ( ( are ( limited ( to ( indicating ( ( the ( atomic skeleton ) ) ( of ( ( ( ( ( ( ( the melanogen ) , ) ( ( the presence ) ( of ( a ( cation ( ( -LRB- ( anion -RRB- ) ) centre ) ) ) ) ) ) and ) ( of ( an ( unpaired electron ) ) ) ) , ) ( that is ) ) ) ) ) ) ) ) , ) ( to ( indicating ( a ( radical-polaronic system ) ) ) ) ) . ) )
(ROOT (S (NP (DT These)) (VP (VBP are) (ADJP (VBN limited) (PP (TO to) (S (VP (VBG indicating) (NP (NP (DT the) (JJ atomic) (NN skeleton)) (PP (IN of) (NP (NP (DT the) (NN melanogen)) (, ,) (NP (NP (DT the) (NN presence)) (PP (IN of) (NP (DT a) (JJ cation) (PRN (-LRB- -LRB-) (NP (NN anion)) (-RRB- -RRB-)) (NN centre)))) (CC and) (PP (IN of) (NP (DT an) (JJ unpaired) (NN electron))) (, ,) (SBAR (WHNP (WDT that)) (S (VP (VBZ is))))))))))) (, ,) (PP (TO to) (S (VP (VBG indicating) (NP (DT a) (JJ radical-polaronic) (NN system)))))) (. .)))
These are limited to indicating the atomic skeleton of the melanogen, the presence of a cation (anion ) centre and of an unpaired electron, that is, to indicating a radical-polaronic system.
(ROOT (S (NP (NNS Electrons)) (ADVP (RB always)) (VP (VBP result) (PP (IN in) (NP (NP (DT an) (NN anion)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (ADJP (ADJP (JJR larger)) (PP (IN than) (NP (DT the) (NN parent) (NN atom)))))))))) (. .)))