1q21.1 microdeletion is a rare chromosomal change; only a few dozen individuals with this deletion have been reported in the medical literature.
How many people are affected by 1q21.1 microdeletion ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: How many people are affected by 1q21.1 microdeletion ? [/INST] \n 1q21.1 microdeletion is a rare chromosomal change; only a few dozen individuals with this deletion have been reported in the medical literature.</s>