▁level ▁is ▁similar ▁in ▁the ▁l ungs ▁and ▁in ▁the ▁skin ▁imp lying ▁that ▁ben zo [ c ] flu or ene ▁is ▁a ▁system ic ▁mut agen . ▁▁ ▁The ▁effects ▁of ▁expos ure ▁to ▁ben zo [ c ] flu or ene ▁were ▁also ▁research ed ▁on ▁r ats . ▁In ▁one ▁of ▁these ▁studies ▁the ▁li ver ▁was ▁established ▁to ▁be ▁the ▁main ▁place ▁of ▁disposition ▁of ▁ben zo [ c ] flu or ene ▁after ▁a ▁single ▁or al ▁do se ▁regardless ▁of ▁the ▁size ▁of ▁the ▁do se . ▁It ▁was ▁found ▁that ▁ 5 5 - 6 9 % ▁of ▁the ▁label led ▁ben zo [ c ] flu or ene ▁was ▁ex cret ed ▁via ▁the ▁f ec es ▁while ▁ 8 – 1 0 % ▁was ▁found ▁to ▁be ▁elimin ated ▁via ▁ur ine . ▁While ▁the ▁ben zo [ c ] flu or ene ▁found ▁in ▁the ▁f ec es ▁was ▁not ▁bi otr ans formed , ▁the ▁ur ine ▁samples ▁mainly ▁showed ▁polar ▁met abol ites ▁of ▁ben zo [ c ] flu or ene . ▁ ▁See ▁also ▁ ▁Ben zo [ a ] flu or ene ▁ ▁References ▁ ▁Category : Pol y cyc lic ▁a rom atic ▁hydro car b ons ▁Category : T et racy clic ▁comp ounds <0x0A> </s> ▁The ▁first ▁USS ▁Nev ada , ▁a ▁monitor , ▁was ▁ordered ▁on ▁ 4 ▁May ▁ 1 8 9 8 . ▁She ▁was ▁awarded ▁to ▁the ▁Bath ▁Iron ▁Works