Before revision:  Apparently, these mismatch positions show no striking pattern using computer pattern recognition tools. 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.
After revision:  We have used L-system generated sequence can be inserted into the OR1D2 subfamily specific star model and novel full length olfactory receptors can be generated.