Fig. 4.

Two fraternal twins track each other closely over the first year of life, in spite of one receiving intensive antibiotic treatment. Each panel shows relative abundances of the 40 most abundant genera in ID10 and ID11, with each bar representing a sample and each colored bar segment representing the relative abundance of the genus indicated in the colour key below. The green line beneath the top panel indicates the period during which ID10 received antibiotic treatment. The corresponding period for ID11 is indicated by the orange line beneath the second panel. The brown horizontal lines indicate time spent outside Norway. Dots beneath the days since birth (x-axes) indicate the time of sampling (dark blue to dark red = early to late)