Body color predominantly shows a cell's preferred environment. pH tolerance colors the cell body, and temperature tolerance colors the cell membrane.
A cell takes environmental damage when outside of its tolerance ranges.
pH in the environment is persistent, and cells take less damage from pH than temperature. Temperature dissipates quickly, but it kills faster.
Control Codons tint cells by the labs they belong to. This makes it more difficult to read the cell's phenotype, but it is still possible for a trained eye to discern what tolerances a cell has from its appearance.
A cell across the Optimal pH range, with neutral 37°C temperature tolerance. Below: the pH color gradient.
A cell across the Optimal Temp range, with neutral pH 7.0 tolerance. Below: the temperature color gradient.
A cell. Columns Optimal pH, rows Optimal Temp.
Each layer across what drives it: alone, then with every layer on. Close crop of the same spot.
The same cell owned by each side, 37°C. Each pair: Cell, then Dish (shown ×2, hard pixels).