OMICS International https://www.omicsonline.org/ 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. https://www.omicsonline.org/ArchiveATBM/currentissue-advanced-techniques-in-biology-medicine-open-access.php Advanced Techniques in Biology & Medicine https://www.omicsonline.org/ArchiveATBM/currentissue-advanced-techniques-in-biology-medicine-open-access.php Advanced Techniques in Biology & Medicine Volume 6, Issue 3 https://www.omicsonline.org/open-access/comparison-of-two-solidphase-extraction-spe-methods-for-the-identification-and-quantification-of-porcine-retinal-protein-markers-b-2379-1764-1000262-102298.html 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