poly·cyt·i·dyl·ic acid noun \ˌpäl-i-ˌsit-ə-ˈdil-ik-\
: RNA or a segment of RNA that is composed of a polynucleotide chain consisting entirely of cytosine-containing nucleotides and that codes for a polypeptide chain consisting of proline residues when functioning as messenger RNA in protein synthesis—called also poly(C); see poly i:c
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