Cell surface expression enhancing peptides (CSEEPs) are short peptide sequences derived from a GPCR’s N-terminal region that are genetically fused to target GPCRs to boost their transport to the cell surface. This modification results in higher surface and overall protein expression, which is crucial for applications such as structure-based drug design, biophysical analysis, and antibody development. The technology works by directly modifying the GPCR DNA sequence, enabling researchers to overcome challenges associated with low expression levels of these receptors.