Provided are methods of detecting replication competent virus, e.g., replication competent retrovirus such as gammaretrovirus or lentivirus, in a sample containing a cell transduced with a viral vector particle encoding a recombinant and or heterologous molecule, e.g., heterologous gene product. The methods may include assessing transcription of one or more target genes, such as viral genes, that are expressed in a retrovirus but not expressed in the viral vector particle. Replication competent retrovirus may be determined to be present if the levels of RNA of the one or more target genes is higher than a reference value, which can be measured directly or indirectly, including from a positive control sample containing RNA from the respective target gene at a known level and/or at or above the limit of detection of the assay.

Provided are methods of detecting replication competent virus, e.g., replication competent retrovirus such as gammaretrovirus or lentivirus, in a sample containing a cell transduced with a viral vector particle encoding a recombinant and/or heterologous molecule, e.g., heterologous gene product. The methods may include assessing transcription of one or more target genes, such as viral genes, that are expressed in a retrovirus but not expressed in the viral vector particle. Replication competent retrovirus may be determined to be present if the levels of RNA of the one or more target genes is higher than a reference value, which can be measured directly or indirectly, including from a positive control sample containing RNA from the respective target gene at a known level and/or at or above the limit of detection of the assay.

Disclosed is a composition for prevention, treatment or ameliorating of atopic dermatitis, the composition containing a monoclonal stem cell obtained via improved subfractionation culturing of a stem cell, a preparation method thereof, and a method for treating atopic dermatitis using the same. According to the improved subfractionation culturing and proliferation method of the stem cell, a desired amount of the monoclonal stem cells may be obtained in a massive manner in a short time via the rapid proliferation of the monoclonal stem cell. The monoclonal mesenchymal stem cell as obtained has an enhanced effect of treatment, prevention or ameliorating of atopic dermatitis, and thus may be usefully used for an atopic dermatitis treatment agent.

Provided are methods of detecting replication competent virus, e.g., replication competent retrovirus such as gammaretrovirus or lentivirus, in a sample containing a cell transduced with a viral vector particle encoding a recombinant and or heterologous molecule, e.g., heterologous gene product. The methods may include assessing transcription of one or more target genes, such as viral genes, that are expressed in a retrovirus but not expressed in the viral vector particle. Replication competent retrovirus may be determined to be present if the levels of RNA of the one or more target genes is higher than a reference value, which can be measured directly or indirectly, including from a positive control sample containing RNA from the respective target gene at a known level and/or at or above the limit of detection of the assay.

Disclosed is a composition for prevention, treatment or ameliorating of atopic dermatitis, the composition containing a monoclonal stem cell obtained via improved subfractionation culturing of a stem cell, a preparation method thereof, and a method for treating atopic dermatitis using the same. According to the improved subfractionation culturing and proliferation method of the stem cell, a desired amount of the monoclonal stem cells may be obtained in a massive manner in a short time via the rapid proliferation of the monoclonal stem cell. The monoclonal mesenchymal stem cell as obtained has an enhanced effect of treatment, prevention or ameliorating of atopic dermatitis, and thus may be usefully used for an atopic dermatitis treatment agent.

The present invention relates to a novel composition of HIV-1 Env proteins that contain structurally and immunologically distinct VI/V2 domains. Methods of isolating such proteins, and methods of using such proteins as immunogens, therapeutic agents, vaccines, and test compounds for use in identifying a HIV antiviral are also provided.

Provided are methods and compositions useful for detecting viral infection or contamination in a biological sample.

Provided are methods of detecting replication competent virus, e.g., replication competent retrovirus such as gammaretrovirus or lentivirus, in a sample containing a cell transduced with a viral vector particle encoding a recombinant and/or heterologous molecule, e.g., heterologous gene product. The methods may include assessing transcription of one or more target genes, such as viral genes, that are expressed in a retrovirus but not expressed in the viral vector particle. Replication competent retrovirus may be determined to be present if the levels of RNA of the one or more target genes is higher than a reference value, which can be measured directly or indirectly, including from a positive control sample containing RNA from the respective target gene at a known level and/or at or above the limit of detection of the assay.