Key:

hm	homozygous	ht	heterozygous	tg	involves transgenes	√	phenotype observed
cn	conditional genotype	cx	complex: > 1 genome feature	ot	other: hemizygous, indeterminate,...	N	normal phenotype

Genotype/
Background:

Phenotypes:

Affected Systems	cx1	cx2	cx3	cx4
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respiratory system	√	√	√	√
decreased airway responsiveness	√	√	√
increased airway responsiveness				√