I just looked up Hypogammaglobinemia on OMIM.org, at their number 307200. It is a deficiency of HG1, a human growth hormone. It results in short stature, and some other skeletal and facial stuff, but is very slow progressing. It can be either spotted in chromosome 13 or X. If you have it, it would be well worth your time to look it up, maybe even on Wiki or Google in addition to OMIM.