The mature product of the "env" gene is the viral spike protein, which has two main parts: the surface protein (SU) and the transmembrane protein (TM) Coffin, JM., Hughes, SH., Vamus HE., editors.
The mature product of the "env" gene is the viral spike protein, which has two main parts: the surface protein (SU) and the transmembrane protein (TM). The SU domain therefore determines the specificity of the virus for a single receptor molecule Coffin, JM., Hughes, SH., Vamus HE., editors.