2.7.4.7 dimer crystallization data 645187 2.7.4.7 additional information enzyme has 2 distinct domains related to TMP-PPase and HMP-P kinase activities 639726 2.7.4.7 tetramer 4 * 31232, deduced from nucleotide sequence 641660 2.7.4.7 tetramer 4 * 33000, SDS-PAGE 641660