In immunology, TCR or BCR or its secreted form antibody.[1] In simpler terms, an antigen is any substance that causes an immune system to produce antibodies against it.[2] Each antibody is specifically selected after binding to a certain antigen because of random somatic diversification in the antibody complementarity determining regions

(没有文件，原文件不完全或已损坏或有密码)

• We are an exchange download platform that only provides communication channels. The downloaded content comes from the internet. Except for download issues, please Google on your own.
• The downloaded content is provided for members to upload. If it unintentionally infringes on your copyright, please contact us.
• Please use Winrar for decompression tools
• If download fail, Try it againg or Feedback to us.
• If downloaded content did not match the introduction, Feedback to us，Confirm and will be refund.
• Before downloading, you can inquire through the uploaded person information

Nothing．