Abstract: Provided are a cell strain for producing a biosimilar drug of Ustekinumab and a production method therefor. Specifically, provided is a Chinese hamster ovary cell S cell strain. The cell strain expresses a full human monoclonal antibody directed against the P40 subunit shared by human IL-12 and human IL-23. The fully human monoclonal antibody directed against the P40 subunit shared by human IL-12 and human IL-23 is a biosimilar drug of Ustekinumab, which not only exhibits high consistency with Ustekinumab in pre-clinical research, but also passes pharmacokinetic bioequivalence and safety similarity evaluation in clinical research. The biosimilar drug of Ustekinumab is the first one that has entered clinical trials in China, is the only one that has completed the I stage clinical trial, and is also one of the biosimilar drugs of Ustekinumab, which has the fastest progress in new drug application in the world.

Abstract: Provided are antibodies and fragments against human interleukin-4 receptor alpha (hIL-4R?) and uses thereof. The antibodies and fragments preferably have heavy chain complementary determining regions as set forth in SEQ ID NOs: 1-3 or 14-16 and light chain complementary determining regions as set forth in SEQ ID NOs: 4-6 or 17-19.

Abstract: Disclosed by the present invention are an anti-human interleukin 17A monoclonal antibody and an application thereof. The epitope of the monoclonal antibody binding to human interleukin 17A comprises 78th asparagine (N78). The antibody may be used to treat rheumatoid arthritis, psoriasis, multiple sclerosis, psoriatic arthritis, plaque psoriasis and/or ankylosing spondylitis.

Abstract: Provided are methods for identifying antibodies that bind to an antigen in primates. In certain embodiments, the methods comprise: sequencing the cDNA prepared from a combined population of antibody-producing B-cells to obtain a plurality of antibody heavy chain sequences and a plurality of antibody light chain sequences; grouping the obtained antibody heavy chain sequences into heavy chain groups based on their CDR3 sequences; grouping the obtained antibody light chain sequences into light chain groups based on their CDR3 sequences; pairing the heavy chain groups with the light chain groups based on the number of antibody heavy chain or light chain sequences in each group; pairing one antibody heavy chain sequence and one light chain sequence in each paired heavy chain group and light chain group; and testing candidate antibodies comprising the paired heavy chain and light chain sequences for binding to the antigen.