( ( ( ( No change ) ( in ( leukocyte migration ) ) ) ( in ( control animals ) ) ) . )
(ROOT (NP (NP (DT No) (NN change)) (PP (IN in) (NP (JJ leukocyte) (NN migration))) (PP (IN in) (NP (NN control) (NNS animals))) (. .)))
No change in leukocyte migration in control animals.
(ROOT (S (NP (NP (DT A) (NN change)) (PP (IN of) (NP (NP (NN season)) (CC and) (NP (JJR less) (NN food))))) (ADVP (RB usually)) (VP (VB cause) (S (NP (JJ certain) (NNS animals)) (VP (TO to) (VP (VB migrate))))) (. .)))
A change of season and less food usually cause certain animals to migrate.