Complex sentence: For each of these housekeeping gene, the different sequences are assigned as alleles and the alleles at the loci provide an allelic profile, a series of profiles can be the identification marker for strain typing.
Split into simpler sentences: For each of these housekeeping genes, the different sequences are assigned as alleles and the alleles at the loci provide an allelic profile. A series of profiles can then be the identification marker for strain typing.