Total RNA was reverse transcribed into cDNA using the Quantitect Reverse Transcription kit (Qiagen). Quantitative PCR (qPCR) was performed in SYBR Green master mix (Qiagen) with an Applied Biosystems 7500 PCR and analyzed with the SDS software (Keenen et al., 2010 (link)) (Thermo Fisher). The mRNA levels of human pigmentation genes MITF, SOX10, TYR, TYRP1, DCT, and IRF4 were normalized to ACTβ. Corresponding murine mRNA levels of Mitf, Sox10, Tyr, Tyrp1, and Dct were normalized to Rpl7. Oligonucleotide primer sequences are listed in Table S1.