Abstract: Herein is reported a method for selecting a variant of a parental antibody variable domain encoding nucleic acid, wherein the parental antibody variable domain amino acid sequence encoded by said encoding nucleic acid has at least one developability hot spot, the method comprising the steps of (i) providing a multitude of DNA-containing samples (genomic material of antibody secreting B-cell) each including one or more antibody variable domain encoding nucleic acids; (ii) performing PCR amplification of said antibody variable domain encoding nucleic acids of (i) using consensus sequence-specific primers to obtain amplification products (wherein said consensus sequence-specific primers bind to consensus sequences that are common to a plurality of genes within the genetic loci set, thereby generating a pool of amplification products); (iii) sequencing a plurality of said amplification products obtained in step (ii) in order to determine the relative proportion of each nucleotide at each position in a sequencing