definiens: means a structurally defined functional RNA molecule usually between 21 and 25 nucleotides in length, which is derived from genetically - encoded non - coding RNA which is predicted to be processed into a hairpin RNA structurethat is a substrate for the double - stranded RNA - specific ribonuclease Drosha and subsequently is predicted to serve as asubstrate for the enzyme Dicer, a member of the RNase III enzyme family ; including, without limitation, those microRNAsexemplified in miRBase ( http://microrna.sanger.ac.uk/ ) . To the extent that scientific developments after the Effective Datewould lead experts in the field of microRNA to expand this definition of microRNA, the Parties agree to discuss redefiningmicroRNA for purposes of this Agreement ; provided, however, that nothing contained herein will require any Party hereto toexpand this definition