cDNA genes are a locus (or region) of DNA for functional transcript RNA or protein. An ELISA is used to detect the expressed protein in biological fluids, serum, saliva.Guinea pig ELISA kits for plasma and sera samples are used to study human genes through the guinea pig model (Cavia porcellus), also called the cavy rodent model. After mouzes and rats Guinea pigs are easy in maintained laboratory animals. cDNAs of Guinea pigs are also very popular.Peptides short amino acid chains or epitopes or blocking antagonists. The shortest peptides are dipeptides, consisting of 2 amino acids joined by a single peptide bond, followed by tripeptides, tetra peptides, ... till polypeptides that are long, continuous, and unbranched synthetic peptide chains. These biological oligomers and polymers can be Solid-phase peptide synthesis (SPPS), or in continue produced for custom peptide synthesis projects. The High-efficiency solid phase peptide synthesis (HE-SPPS) is give very low production costs.