Before revision:  In an attempt to find a mathematical rule in those mismatches, we find that L-system generated sequence can be inserted into the OR1D2 subfamily specific star model and novel full length olfactory receptors can be generated. This remarkable mathematical principle could be utilized for making new subfamily OR members from any OR subfamily. Aroma and electronic nose industry might utilize this rule in a large way in near future .
After revision:  In an attempt to find a mathematical rule in those mismatches, we find that L-system mathematics and have been able to show a closely related subfamily of OR1D2, OR1D4 and OR1D5 .