Fig. 3From: Proteinase K treatment improves RNA recovery from thyroid cells fixed with liquid-based cytology solutionEffect of Proteinase K treatment on RNA recovery from CytoRichRed-fixed thyroid FNAB specimens. The thyroid FNAB specimens processed for LBC using CytoRich-Red solution were trapped to filters in the same way as described above. RNA was extracted from the specimens after incubation with Proteinase K-containing and Proteinase K-free buffers for 3 h at 55 °CBack to article page