Kirchhoff, F., Pöhlmann, S., Hamacher, M., Means, R. E., Kraus, T., Uberla, K., & Di Marzio, P. (1997). Simian immunodeficiency virus variants with differential T-cell and macrophage tropism use CCR5 and an unidentified cofactor expressed in CEMx174 cells for efficient entry.

Kirchhoff, F., S. Pöhlmann, M. Hamacher, R E. Means, T. Kraus, K. Uberla, and P. Di Marzio. Simian Immunodeficiency Virus Variants With Differential T-cell and Macrophage Tropism Use CCR5 and an Unidentified Cofactor Expressed in CEMx174 Cells for Efficient Entry. 1997.

Kirchhoff, F., et al. Simian Immunodeficiency Virus Variants With Differential T-cell and Macrophage Tropism Use CCR5 and an Unidentified Cofactor Expressed in CEMx174 Cells for Efficient Entry. 1997.