Gamma globulin and Immune serum globulin

Gamma globulin noun - A plasma protein containing the immunoglobulins that are responsible for immune responses.

Immune serum globulin and gamma globulin are semantically related. In some cases you can replace phrase "Immune serum globulin" with "Gamma globulin", this phrases are similar.

Immune serum globulin noun - A class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the immune response.

Gamma globulin and immune serum globulin are semantically related. You can use "Gamma globulin" instead a noun phrase "Immune serum globulin".