( ( use ( of ( a ( single ( uppercase letter ) ) ) ) ) ( ( is encouraged ) . ) )
(ROOT (S (NP (NP (NN use)) (PP (IN of) (NP (DT a) (JJ single) (NN uppercase) (NN letter)))) (VP (VBZ is) (VP (VBN encouraged))) (. .)))
use of a single uppercase letter is encouraged.
(ROOT (S (SBAR (WHADVP (WRB When)) (S (VP (VBD represented) (PP (IN by) (NP (DT a) (JJ single) (NN letter)))))) (, ,) (NP (JJ dominant) (NNS alleles)) (VP (VBP are) (VP (VBN represented) (PP (IN by) (NP (JJ uppercase) (NNS letters))))) (. .)))