( ( A blastocyst ) ( ( is ( ( an ( advanced embryo ) ) ( that ( ( ( has ( continued ( to divide ) ) ) and ) ( now ( has ( reached ( ( ( a stage ) closer ) ( to implantation ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN blastocyst)) (VP (VBZ is) (NP (NP (DT an) (JJ advanced) (NN embryo)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ has) (VP (VBN continued) (PP (TO to) (NP (NN divide))))) (CC and) (VP (ADVP (RB now)) (VBZ has) (VP (VBN reached) (PP (ADVP (NP (DT a) (NN stage)) (RBR closer)) (TO to) (NP (NN implantation)))))))))) (. .)))
A blastocyst is an advanced embryo that has continued to divide and now has reached a stage closer to implantation.
(ROOT (S (PP (IN After) (NP (NN implantation))) (, ,) (NP (DT the) (NN blastocyst)) (VP (VBZ is) (VP (VBN called) (NP (DT an) (NN embryo)))) (. .)))