OMICS International OMICS International is a scientific organization that drives the progress of research through open access journals and organizes international conferences, The best in science news, commentary, and research. Advanced Techniques in Biology & Medicine Advanced Techniques in Biology & Medicine Volume 6, Issue 3 Comparison of Two SolidPhase Extraction SPE Methods for the Identification and Quantification of Porcine Retinal Protein Markers by LCMSMS Carsten Schmelter , Sebastian Funke , Jana Treml , Anja Beschnitt , Natarajan Perumal , Caroline Manicam , Norbert Pfeiffer and Franz H Grus