MKI67 and infection: We then analyzed Ki67 RNA levels in 380 cytoplasmic RNA samples derived from 19 humanized livers across four experiments: four livers collected on day 257 post-infection (pi) from experiment 1, three livers on day 218 pi from experiment 2, eight livers on days 18, 45, 50, 52, 82, 99, 141, and 212 pi from experiment 3, and four livers on day 230 pi from experiment 4.