2.7.7.32 galactose-1-phosphate thymidylyltransferase; dTDP galactose pyrophosphorylase; galactose 1-phosphate thymidylyl transferase; thymidine diphosphogalactose pyrophosphorylase; thymidine triphosphate:alpha-D-galactose 1-phosphate thymidylyltransferase