The repressor is a dimer of a 236 amino acid subunit. Each subunit consists of two domains, one of which (the N-terminal) includes the helix-turn-helix motif and binds DNA, while the other is responsible for the formation of dimers. However, the two domains of one subunit can be separated by mild proteolysis.
The purpose of a marriage license is to provide proof that a couple is allowed to enter into a legally recognized marriage. In order to receive a marriage license, couples must provide proof of their eligibility of meeting all state requirements.
A marriage certificate is a document that proves you are married. Typically, couples obtain a marriage license, hold the wedding ceremony, and then have the person who performed the ceremony file a marriage certificate in the appropriate county office within a few days. This may be the office of the county clerk, recorder or registrar, depending on where you live.