Parameter sets with >=0.2 relative amplitude in L/S ratio and <0.2 relative amplitude in L+S are defined as Class III, while those with and >=0.2 relative amplitude in both L/S ratio and L+S are defined as Class IV. Graph: Fig 5 Factors distinguishing between Class III and Class IV PAR mRNAs.(A) Characteristics of Class III and the hypothetical Class IV mRNAs.