( ( beings ( who ( ( ( are all ) ( small ( in size ) ) ) ( as aliens ) ) ) ) ( ( ( are commonly ) described ) . ) )
(ROOT (S (NP (NP (NNS beings)) (SBAR (WHNP (WP who)) (S (VP (VBP are) (RB all) (ADJP (JJ small) (PP (IN in) (NP (NN size)))) (PP (IN as) (NP (NNS aliens))))))) (VP (VBP are) (ADVP (RB commonly)) (VP (VBN described))) (. .)))
beings who are all small in size as aliens are commonly described.
(ROOT (S (NP (DT All) (NNS cells)) (VP (VBP have) (NP (NP (DT the) (JJ small) (NN size)) (PP (IN in) (NP (JJ common))))) (. .)))