( ( Areas ( of ( focus ( within microbiology ) ) ) ) ( ( are ( prokaryotes ( , ( eukaryotes ( , ( protists ( , ( viruses ( , ( ( prions and ) fungi ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Areas)) (PP (IN of) (NP (NP (NN focus)) (PP (IN within) (NP (NN microbiology)))))) (VP (VBP are) (NP (NNS prokaryotes) (, ,) (NNS eukaryotes) (, ,) (NNS protists) (, ,) (NNS viruses) (, ,) (NNS prions) (CC and) (NNS fungi))) (. .)))
Areas of focus within microbiology are prokaryotes, eukaryotes, protists, viruses, prions and fungi.
(ROOT (S (NP (NNS Protists)) (VP (VBP are) (VP (VBN thought) (S (VP (TO to) (VP (VB be) (NP (DT the) (JJS oldest) (NNS eukaryotes))))))) (. .)))