Something BIG is coming!
If Ig is used to mean Immunoglobulin
Then could the Ig produced by B-cells
Be called B-Ig?
BIG
I think it is worth digging into B-cells and Coronaviruses
https://oncologypro.esmo.org/education-library/essentials-for-clinicians/lymphomas/immunoglobulins-and-b-cell-development
Pre-B-cells continue this somatic recombination process by rearranging the L chain to become an immature B-cell, expressing IgM on their surface.