17.0 INFORMED CONSENT 
All patients entering this study must give written, informed consent. In addition, 
patients between the ages of 7 and 18 should sign the Assent form appended. 
Because of the investigational nature of the gene marking procedure, all informed 
consent should be obtained in the presence of both a study investigator and an 
individual not directly involved with the protocol. In the event of disparity between 
the wishes of the child and the wishes of the legal guardian, a member of the Social 
Work or Psychology Departments will act as patient advocate and witness the 
consent/assent. 
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