| ROS | reactive oxygen species; review of systems; rod outer segment |
|---|---|
| nov | sp new species [Lat. novum species] |
| ROI | reactive oxygen intermediate; region of interest; right occipitolateral [fetal position] |
| IRS | immunoreactive secretion; infrared spectrophotometry; insulin receptor species; insulin receptor sub... |
| Sp | the most posterior point on the posterior contour of the sella turcica; species; specific; specimen;... |