Migration through physical constraints is enabled by MAPK-induced cell softening via actin cytoskeleton re-organization by Rudzka, DA, Spennati, G, McGarry, DJ, Chim, Y, Neilson, M, Ptak, A, Munro, J, Kalna, G, Hedley, A, Moralli, D, Green, C, Mason, S, Blyth, K, Mullin, M, Yin, H, Olson, MF