Donor selection was based on the presence of obesity-risk SNP of the FTO locus, so donors 1 to 3, 4 to 6, and 7 to 9 carried a T/T risk-free, a T/C heterozygous, or a C/C obesity-risk genotype, respectively. The gene discussed is FTO; the disease is obesity due to melanocortin 4 receptor deficiency.