Cytogenetically, the fusion is cryptic but seen by FISH on amplified episomes or more rarely as a small hsr.

HSRs regressed spontaneously or were treated with antihistamines with or without corticosteroids.

Conclusions: ESC and HSR test results are significantly affected by the test diluent.

HSR values were also significantly lower in the Composol study groups.

Obama can expect to take flack from both sides of the HSR argument.