Changes in library complexity over time. Dashed lines indicate median RPKM at each time-point. A) Density plots of RPKM values among all three individuals at 0 hours and 12 hours. B) as A, but 0 hours and 24 hours. C) as A, but 0 hours and 48 hours. D) as A, but 0 hours and 84 hours. RPKM, reads per kilobase transcript per million.