8DUAN X, NAUWYNCK H J,PENSAERT M B. Virus quantification and identification of cellular targets in the lungs and lymphoid tis- sues of pigs at different time intervals 'after inoculation with porcine reproductive and respiratory syndwme virus (PRRSV) [ J ]. Vet Microbiol, 1997,56(1/2) :9 - 19.
9TANIURA S, KAMITANI H,WATANABE T,et .,d. Transcriptional regulation of cyclooxygenase - l by histone deaeetylase inhibitors in normal human astroeyte cells [ J ]. J Bio Chem, 2002,277 ( 19 ) : 16823 -16830.
10FORSBERG R, STORGAARD T, NIELSEN H S, et al. The genet- ic diversity of European type PRRSV is similar to that of the North American type but is geographically skewed within Europe [ J ]. Vi- wlogy,2002,299 ( 1 ) ,38 - 47.
