DHCR7 and psoriasis: Of note are the appearances of: a) POLD3 (OMIM: 611415) for both winter solar radiation and temperature; b) the psoriasis associated [36] solute carrier transporter locus SLC12A8 (OMIM: 611316) for winter solar radiation; c) delta-7-sterol reductase gene DHCR7 (OMIM: 602858), the penultimate enzyme of cholesterol synthesis, for winter solar radiation; and d) ADRA2A for both summer precipitation and winter solar radiation.