- U rop yg ial ) ▁. ▁Although ▁Lav ender ▁loc us ▁is ▁linked ▁to ▁the ▁R ▁( rose ▁comb ) ▁loc us ▁by ▁ 3 2 . 5 %, ▁its ▁position ▁has ▁not ▁yet ▁mapped ., ▁ ▁Hom olog ous ▁mut ations ▁in ▁other ▁species ▁ ▁Until ▁now , ▁all ▁the ▁reported ▁caus al ▁mut ations ▁in ▁M LP H ▁( mel an oph il in ) ▁of ▁humans , ▁m ice ▁and ▁other ▁species ▁have ▁been ▁single - base ▁substitution s ▁or ▁small ▁delet ions , ▁the ▁effects ▁of ▁which ▁were ▁limited ▁to ▁the ▁dil ution ▁of ▁hair ▁or ▁fe ather ▁colour . ▁ ▁The ▁M LP H - associ ated ▁dil ution ▁of ▁coat ▁or ▁pl um age ▁p ig ment ation ▁should ▁then ▁result ▁in ▁the ▁defect ive ▁transport ▁of ▁mel anos om es . ▁This ▁produces ▁a ▁dil uted , ▁lead en ▁or ▁lav ender ▁blue - gre y ▁colour ▁and ▁has ▁been ▁reported ▁in ▁several ▁m amm als : ▁humans ▁( Gr is cel li ▁synd rome ▁type ▁ 3 ), ▁m ice , ▁c ats , ▁dogs ▁and ▁m inks ▁ ▁In ▁Japanese ▁qu ail ▁ ▁The ▁lav ender ▁phen ot ype ▁in ▁Japanese ▁qu ail ▁( C ot urn ix ▁cot urn ix ▁japon ica ) ▁is ▁a ▁dil ution ▁of ▁both ▁e um el an in ▁and ▁ph ae om el an in ▁in ▁fe athers ▁that ▁produces ▁a ▁blue - gre y ▁colour ▁on ▁a ▁wild - type ▁fe ather ▁pattern ▁background .