The following refs may be related to what you are looking for. Liu and Raghothama (1996) Practical method for cloning cDNAs generated in an mRNA differential disply. BioTechniques 20, 576-580. Vogeli-Lange et al. (1996) Rapid selection and classification of positive clones generated by mRNA differential disply. Nucleic Acids Res. 24, 1385-1386.