 For genotyping of microorganisms for medical diagnosis, or other purposes, scientists may use a wide variety of DNA profiling techniques, such as PCR, PFGE and MLST . A complication of this broad variety of pre-WGS techniques is the difficulty to standardize between techniques, laboratories and microorganisms, which may be overcome using the complete DNA code of the genome generated by WGS techniques.
<meaning-changed>  For genotyping of microorganisms for medical diagnosis, or other purposes, scientists may use a wide variety of DNA profiling techniques, such as PCR, PFGE and MLST . A complication of this broad variety of pre-WGS techniques is the difficulty to standardize between techniques, laboratories and microorganisms, which may be overcome using the complete DNA code of the genome generated by WGS techniques.
 For genotyping of microorganisms for medical diagnosis, or other purposes, scientists may use a wide variety of DNA profiling techniques, such as polymerase chain reaction, pulsed-field gel electrophoresis or multilocus sequence typing . A complication of this broad variety of pre-WGS techniques is the difficulty to standardize between techniques, laboratories and microorganisms, which may be overcome using the complete DNA code of the genome generated by WGS techniques.