Polyinosinic:polycytidylic acid, poly-ʟ-lysine, and carboxymethylcellulose (letter roots of the acronym underlined), a synthetic immunostimulant mimicking viral double-stranded RNA.
Source: PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1232 [Terms] [Paper]