Behavior in region IIIa. (A) Region IIIa shown in a bifurcation diagram for increasing Dicer cleavage rate (a
= 100, 4 siRNAs per amplified transcript). Black lines indicate plus-strand RNA, violet lines the number of virions produced, and cyan lines the total number of siRNAs. (B) A timeplot showing the behavior in region IIIa (c
= 15) with plus-strand RNA (black); minus-strand RNA (red); total number of virions (violet); total siRNA (cyan); free RISC (orange); active RISC (green).