: a relatively short polypeptide chain with a molecular weight of about 35,000 daltons and a high number of cysteine residues that is found in antibodies of the IgM and IgA classes
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“J chain.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/J%20chain. Accessed 24 Nov. 2024.
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