CFP and infection: We transduced each population with three LeGO lentiviral particle constructs carrying the genetic code of Cerulean39 (CFP variant, assigned to Blue), Venus40 (YFP variant, Green) and tdTomato41 (RFP variant, Red) at equal dosages of multiplicity of infection (MOI) 0.7, 1.4, 2.8, 4.9, and 7.0 respectively.