derived In this case, referring to the allele that arose second, or what we would call the mutant allele.

Scleporus undulatus (His208 => Tyr) the species that whose mutation is dominant and has a defect in receptor getting to the surface

Aspidoscelis inornata (Thr170 => Ile) the species with a recessive mutation that does transmit signal effectively to the internal cellular pathway

Holbrookia maculata (Val168 => Ile) the species for which no defect could be found during studies in human cells