Each one is a suspect. You are the detective.

Figure out Who — or What — Am I?

1. I am the bouncer at the B-cell club — I decide who gets a long life and who gets kicked out by apoptosis. SLE patients let in far too many riff-raff. Who am I?
2. I am the “middle child” of the complement family — never the glamorous recognition complex, never the dramatic pore-former. I just coat the bug and wait for someone to eat it. Who am I?
3. I present the evidence, I run the courtroom, but I never pull the trigger myself. Without me, the T cell is just an angry cell with no address. Who am I?
4. I am the reason your patient feels like they’ve been hit by a bus even on a Monday with no infection. I am the main conductor of the acute-phase orchestra and CRP is my star violinist. Who am I?
5. I am the neutrophil’s personal GPS — without me, they get lost and never reach the party. I am elevated in gout, septic joints, and anywhere a crystal decides to vacation. Who am I?
6. I wear lupus’s coat, carry a swollen belly bouncer, and grow a pea sized sentinels in my neck-yet I am an imposter. My cells got a memo saying “never retire,” and they took it too seriously. Who am I?
7. My patients handle pneumococcus and H. flu like champions — but one whiff of meningococcus and it’s game over. I am the missing piece at the very end of a long cascade. Who am I?
8. 08. I “can’t see, can’t pee, can’t climb a tree”. I follow a consequence — usually from somewhere south of the stomach or south of the belt. Who am I?
9. 9. I am the old faithful of lupus—but 2025 put me in a Goldilocks zone: too little and the butterfly flares, too much and the kidneys waves a white flag. Pregnant women love me for soothing their kid’s heart, and I cost almost nothing. My sweet spot sits between two numbers. Who am I and what’s the range?
10. I am the new oral kid on the block who proudly skipped the JAK family reunion—I silenced a different, quieter cousin upstream instead. I got my FDA stamp for the peripheral crowd with scaly skin and swollen joints, but my spine chapter is still being written. Who am I?
11.  I shake both hands at the same time. I crashed the quiet organ strangling party of an IgG-obsessed disease, and sent the steroid bottle on a long holiday. Who am I?
12. I am five letters of pure chaos, love me-a waterlogged belly, a fever that wont clock out, marrow too tired to make blood cells, and a platelet count that quit the job entirely. I am the dream of many hematologists. Who am I?
13. I give my patient linebacker shoulders without a single trip to the gym. Light chains padded out the joint capsules instead of muscle. Who am I?
14. I throw a four-ring circus in one head — a swollen cheek gland, a drooping half-face, angry eyes, and a fever. Who am I?
15. I am not a rogue antibody — I’m a typo in a gene named after fire. That typo turns a peacekeeping protein into an arsonist. My favourite victims share a Mediterranean postcode, my attacks come and go like an uninvited guest, and my kryptonite is a bitter old alkaloid borrowed from the gout clinic.
16. Everyone blames me on “just getting old” — but I have a favourite pair of knuckles that osteoarthritis usually ignores, and I decorate the wrist with spurs like beak. Who am I?
17. I paint the nose, cheeks, and ears a permanent purplish frostbite — except there was no winter involved. My family loves tight little clusters of pink and blue cells that mimic infection but never grow a single bug on culture. Who am I?
18. I destroy a joint so thoroughly it rattles like a bag of loose bones — yet my patient feels nothing, because the nerves clocked out long before I arrived. Who am I?
19. I am the pink ring often noticed and often not, over your trunk, politely avoiding the face, days after you had your bad throat. Who am I?

ANSWERS –

1: T Follicular Helper Cell (Tfh)

2: C3b (Opsonin)

3. MHC Class II / Antigen Presenting Cell
4. IL-6
5. IL-8 (CXCL8)
6. ALPS (Autoimmune Lymphoproliferative Syndrome)
7. Terminal Complement Deficiency (C5–C9 / MAC)
8. Reactive Arthritis (Reiter’s Syndrome)
9. Hydroxychloroquine, therapeutic blood level 750-1500ng/ml
10. Deucravacitinib (FDA approved for PsA 2026)
11. Obexelimab–bifunctional antibody

   12. TAFRO

   13. Shoulder Pad sign (AL amyloidosis)

14. Uveoparotid fever (Heerfordt syndrome)

   15. Familial Mediterranean Fever

16. Hemochromatosis arthropathy
17. Lupus pernio
18. Charcot joint
19. Erythema marginatum