"variable region." YourDictionary, n.d. Web. 13 December 2018. <https://www.yourdictionary.com/variable-region>.
variable region. (n.d.). Retrieved December 13th, 2018, from https://www.yourdictionary.com/variable-region
The portion of the amino (NH2) terminal of an antibody's heavy and light chains having a variable amino acid sequence. The structure of the variable region determines the antigenic specificity of the antibody.