A syncytia assay for human immunodeficiency virus type I (HIV-I) envelope protein and its use in studying HIV-I mutations.

Antigens, Differentiation, T-Lymphocyte/genetics Blotting, Western Gene Expression Regulation Gene Products, gag Gene Products, tat HIV Antigens/genetics HIV Envelope Protein gp120 HIV Envelope Protein gp160 HIV Envelope Protein gp41 HIV-1/genetics,immunology HeLa Cells Humans Mutation Plasmids Precipitin Tests Retroviridae Proteins/analysis,genetics Transcription Factors/genetics Transfection Viral Envelope Proteins/analysis,genetics tat Gene Products, Human Immunodeficiency Virus

Antigens, Differentiation, T-Lymphocyte Gene Products, gag Gene Products, tat HIV Antigens HIV Envelope Protein gp120 HIV Envelope Protein gp160 HIV Envelope Protein gp41 Retroviridae Proteins Transcription Factors Viral Envelope Proteins tat Gene Products, Human Immunodeficiency Virus