passages.id: split_4_test_1988_passage
passages.type: progene_text
passages.text: Pretreatment with 0.4 % sodium hyaluronate reduced mean histamine 7.1 % compared with stressed controls but completely prevented any increase in the same group of 8 rats , in which it was 174.5 +/- 23.1 before and remained 179.4 +/- 9.9 ng. / ml. after stress ( p = 0.75 ) .