Trichothiodystrophy 2, Photosensitive, also known as ttd2, is related to trichothiodystrophy and xeroderma pigmentosum-cockayne syndrome complex. An important gene associated with Trichothiodystrophy 2, Photosensitive is ERCC3 (ERCC Excision Repair 3, TFIIH Core Complex Helicase Subunit), and among its related pathways/superpathways are RNA Polymerase I Transcription Termination and Transcription_P53 signaling pathway. Affiliated tissues include testis and skin, and related phenotypes are coarse hair and ichthyosis