- A naturally occurring MTA1 variant sequesters oestrogen receptor-alpha in the cytoplasm. Kumar, R., Wang, R.A., Mazumdar, A., Talukder, A.H., Mandal, M., Yang, Z., Bagheri-Yarmand, R., Sahin, A., Hortobagyi, G., Adam, L., Barnes, C.J., Vadlamudi, R.K. Nature (2002)