Asymmetric cell division shapes naive and virtual memory T-cell immunity during ageing by Borsa, M, Barandun, N, Gräbnitz, F, Barnstorf, I, Baumann, NS, Pallmer, K, Baumann, S, Stark, D, Balaz, M, Oetiker, N, Wagen, F, Wolfrum, C, Simon, AK, Joller, N, Barral, Y, Spörri, R, Oxenius, A