LZ can try contact to below paper
De Lay N, Gottesman S. (2011)
Role of polynucleotide phosphorylase in sRNA function in Escherichia coli.
RNA. 17: 1172-89.
//www.ncbi.nlm.nih.gov/pubmed/21527671
last/corresponding author
mail address within below link:
//ccr.cancer.gov/staff/staff.asp?profileid=5786
