TOWARDS A YAC CLONE OVERLAP MAP OF THE HUMAN X-CHROMOSOME by Ross, M, Knights, C, Crollius, H, Holloway, E, Li, K, Mifsud, J, Grigoriev, A, Mott, R, Labella, T, Vatcheva, R, Kumlien, J, Monaco, T, Zehetner, G, Bhogal, R, See, C, Povey, S, Marsh, S, Carter, N, Lepaslier, D, Cohen, D, Nussbaum, R, Lehrach, H