1. antibodies that have the same constant region structure and belong to the same class or subclass
Usage: immunology; biochemistry
2. nuclides that have the same mass number but different atomic numbers
Usage: nuclear physics; chemistry

Examples

• The researcher studied different isotypes of immunoglobulin G.
• IgA and IgM are examples of antibody isotypes with distinct functions.
• Scientists compared the binding properties of various antibody isotypes.
• The nuclear physicist explained how isotypes share the same mass number.
• Carbon-14 and nitrogen-14 are isotypes with identical mass numbers.
• The laboratory identified several isotypes in the radioactive sample.