IFNG and influenza: This regulation was not necessary to explain the atrophy rebound per se, but provided a slightly better fit, thus written ‘optional’ in Figure 2B. The mechanistic impact of influenza did not seem to be direct, as influenza viremia peaks typically much earlier than the peak of atrophy at day 10, suggesting the existence of a downstream factor inducing atrophy, such as glucocorticoids or IFN-γ production by NK or CD8αα cells [54].