Line up 3 of the same shape to beat the viruses. Clear them all before Hal's fever hits 40°C.
Shiro the white blood cell
I'm Shiro. Let's protect Hal's body together!
Build the DNA!
Complete the right side. Place the sugar first, then attach the phosphate (P) and the base. Bases pair A–T and G–C!
DNA evolved!
In real bodies too, the DNA of antibody-making cells changes little by little, and the ones that fit the virus best are selected and multiply (affinity maturation).
Viruses in Hal's body!
Team up with Shiro the white blood cell to protect Hal.