( It ( ( occurs ( ( ( ( in ( ( single-celled organisms ) ( such ( as yeast ) ) ) ) , ) ( as ( well as ) ) ) ( in ( ( ( multicellular organisms ) , ) ( such ( as humans ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ occurs) (PP (PP (IN in) (NP (NP (JJ single-celled) (NNS organisms)) (PP (JJ such) (IN as) (NP (NN yeast))))) (, ,) (CONJP (RB as) (RB well) (IN as)) (PP (IN in) (NP (NP (NN multicellular) (NNS organisms)) (, ,) (PP (JJ such) (IN as) (NP (NNS humans))))))) (. .)))
It occurs in single-celled organisms such as yeast, as well as in multicellular organisms, such as humans.
(ROOT (S (NP (NNP Single-celled)) (VP (VBP are) (ADJP (JJ yeasts))) (. .)))