( ( By ( studying ( samples ( of ( amniotic ( fluid ( or ( bone marrow ) ) ) ) ) ) ) ) ( , ( Donahue ( ( ( diagnoses ( such diseases ) ) ( as ( ( ( ( ( cystic fibrosis ) , ) ( muscular dystrophy ) ) and ) ( ( specific types ) ( of leukemia ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN By) (S (VP (VBG studying) (NP (NP (NNS samples)) (PP (IN of) (NP (JJ amniotic) (NN fluid) (CC or) (NN bone) (NN marrow))))))) (, ,) (NP (NNP Donahue)) (VP (VBZ diagnoses) (NP (JJ such) (NNS diseases)) (PP (IN as) (NP (NP (JJ cystic) (NN fibrosis)) (, ,) (NP (JJ muscular) (NN dystrophy)) (CC and) (NP (NP (JJ specific) (NNS types)) (PP (IN of) (NP (NN leukemia))))))) (. .)))
By studying samples of amniotic  fluid or bone marrow, Donahue diagnoses such diseases as cystic fibrosis, muscular dystrophy and specific types of leukemia.
(ROOT (S (NP (JJ Muscular) (NN dystrophy)) (VP (VBZ is) (NP (DT a) (DT a) (NN wasting) (NN disease))) (. .)))