The La antigen inhibits the activation of the interferon-inducible protein kinase PKR by sequestering and unwinding double-stranded RNA. - Qiurong Xiao; Tyson V. Sharp; Ian W. Jeffrey; Marion C. James; Ger J. M. Pruijn; Walther J. van Venrooij; Michael J. Clemens (Nucleic Acids Res., 1994)