( ( the ( notochordal process ) ) ( ( ( goes ( through ( several ( structural transformations ) ) ) ) ( before ( becoming ( ( ( ( ( the ( solid rod ) ) , ) ( known ( as ( the notochord ) ) ) ) , ) ( around ( day 24 ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT the) (JJ notochordal) (NN process)) (VP (VBZ goes) (PP (IN through) (NP (JJ several) (JJ structural) (NNS transformations))) (PP (IN before) (S (VP (VBG becoming) (NP (NP (DT the) (JJ solid) (NN rod)) (, ,) (VP (VBN known) (PP (IN as) (NP (DT the) (NN notochord)))) (, ,) (PP (IN around) (NP (NN day) (CD 24)))))))) (. .)))
the notochordal process goes through several structural transformations before becoming the solid rod, known as the notochord, around day 24.
(ROOT (S (NP (DT The) (NN notochord)) (VP (VBZ provides) (S (NP (NNS stiffness)) (VP (TO to) (VP (VB counterbalance) (NP (NP (DT the) (NN pull)) (PP (IN of) (NP (NNS muscles)))))))) (. .)))