( ( Exposure ( to ( the ( magnetic field ) ) ) ) ( ( ( ( ( ( ( was ( not mutagenic ) ) , ) ( ( did not ) ( enhance ( ( the mutagenicity ) ( of ( 8 ( chemical mutagens ) ) ) ) ) ) ) , ) and ) ( ( did not ) ( enhance ( ( the mutagenicity ) ( of ( UV radiation ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Exposure)) (PP (TO to) (NP (DT the) (JJ magnetic) (NN field)))) (VP (VP (VBD was) (ADJP (RB not) (JJ mutagenic))) (, ,) (VP (VBD did) (RB not) (VP (VB enhance) (NP (NP (DT the) (NN mutagenicity)) (PP (IN of) (NP (CD 8) (NN chemical) (NNS mutagens)))))) (, ,) (CC and) (VP (VBD did) (RB not) (VP (VB enhance) (NP (NP (DT the) (NN mutagenicity)) (PP (IN of) (NP (NNP UV) (NN radiation))))))) (. .)))
Exposure to the magnetic field was not mutagenic, did not enhance the mutagenicity of 8 chemical mutagens, and did not enhance the mutagenicity of UV radiation.
(ROOT (S (NP (NP (NNP Radiation)) (, ,) (NP (NNS chemicals)) (, ,) (CC and) (NP (JJ infectious) (NNS agents))) (VP (VBP are) (NP (NP (NNS types)) (PP (IN of) (NP (NNS mutagens))))) (. .)))