neural folds
... that neural folds turn into the central nervous system?
... that <b id="mwCK0"><a href="./Neural_fold" id="mwCK4" rel="mw:WikiLink" title="Neural fold">neural folds</a></b> turn into the <a href="./Central_nervous_system" id="mwCK8" rel="mw:WikiLink" title="Central nervous system">central nervous system</a>?