. . "In some embodiments is a eukaryotic cell comprising a removable-tether display vector comprising an origin of replication, a first promoter operably linked to a first polynucleotide encoding an immunoglobulin heavy chain constant domain or an immunoglobulin light chain constant domain, a second polynucleotide encoding an immunoglobulin heavy chain constant domain or an immunoglobulin light chain c" . .