Experiment 1: surviving fraction A 0.667, B 0.532, A+B 0.279; Bliss expectation 0.355; HSA (best single drug) 0.532
  Wells as n, HSA: A+B vs B alone, Welch's t-test p = 1.4e-05
  Wells as n, Bliss: A+B wells vs the Bliss expectation, one-sample t-test p = 0.009
Each experiment: observed / Bliss-expected surviving fraction [observed / HSA]:
  Experiment 1: 0.79 [0.52]
  Experiment 2: 1.35 [0.89]
  Experiment 3: 1.38 [0.70]
  Experiment 4: 0.87 [0.55]
  Experiment 5: 1.09 [0.57]
Across 5 experiments, observed / Bliss expected: 1.07 (95% CI 0.78 to 1.47), one-sample t-test on the log ratios p = 0.58
Across 5 experiments, observed / HSA expected: 0.63 (95% CI 0.48 to 0.83), one-sample t-test on the log ratios p = 0.0096