| ISOTYPE | Term for a class of antibodies that shares its name with pansophist Otto Neurath's picture language (7) |
| KNOWALL | Brainiac, clever clogs, pansophist, polymath or walking encyclopedia who is omnisciently well-read, albeit only in their own head (4-3) |
| JETSET | Term coined in the 1950s for a class of rich and fashionable people who fly/travel widely for pleasure (3,3) |
| STEROID | Rides to different place for a class of drug (7) |
| ANTIGEN | What is a substance that stimulates production of antibodies in the blood? (7) |
| CATEGORY | Word, from the Greek for a public accusation, for a class, family, group or order of similar things (8) |
| OBIT | It's published of late of rising sample of antibodies (6) |
| VACCINE | Plant that includes a small volume of antibodies? |
| IMMUNE | Resistant to a specific disease by the presence of antibodies in the blood (6) |
| ALYCIDON | One of the racehorses whose name was used for a Class 55. Only a CID officer can tell you which one (8) |
| GRADE | What is another name for a class or a year at school? |
| SERUM | Everything around hospital area is a source of antibodies (5) |
| ANTIGENS | Substances that stimulate the production of antibodies (8) |
| IMMUNOGLOBULIN | Any of a class of blood proteins that function as antibodies (14) |
| ANTIGENIC | Stimulating the production of antibodies |
| VACCINES | They stimulate the production of antibodies to help prevent disease |
| IG | A class of proteins produced in lymph tissue in vertebrates and that function as antibodies in the i |
| ZANYMOMENT | Tick of time for a class clown's antics? |
| PROJECTRUNAWAY | Bad person to get paired with for a class assignment? |
| TRACTOR | One of the nicknames for a Class 37 locomotive (7) |
