( GBMs ( ( ( occur ( most often ) ) ( ( ( ( in ( the cerebrum ) ) , ) especially ) ( in ( ( the ( frontal ( and ( temporal lobes ) ) ) ) ( of ( the brain ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS GBMs)) (VP (VBP occur) (ADVP (RBS most) (RB often)) (PP (PP (IN in) (NP (DT the) (NN cerebrum))) (, ,) (RB especially) (PP (IN in) (NP (NP (DT the) (JJ frontal) (CC and) (JJ temporal) (NNS lobes)) (PP (IN of) (NP (DT the) (NN brain))))))) (. .)))
GBMs occur most often in the cerebrum, especially in the frontal and temporal lobes of the brain.
(ROOT (S (NP (NP (DT The) (JJ iconic) (JJ gray) (NN mantle)) (PP (IN of) (NP (DT the) (JJ human) (NN brain))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ appears) (S (VP (TO to) (VP (VB make) (PRT (RP up)) (NP (NP (JJS most)) (PP (IN of) (NP (NP (DT the) (NN mass)) (PP (IN of) (NP (DT the) (NN brain)))))))))))) (, ,)) (VP (VBZ is) (VP (VBN called) (NP (DT the) (NN cerebrum)))) (. .)))