passages.id: split_6_test_1328_passage
passages.type: progene_text
passages.text: In rats given methoxychlor the ratios of the 27 - kDa protein mRNA to the 18S ribosomal RNA declined from 2.2 +/- 0.27 x 10(-3) ( controls ) to 0.99 +/- 0.09 x 10(-3) ( 100 mg / kg / day ) .