title: Iodine distribution in the thyroid follicles of the hagfish, Eptatretus burgeri and lamprey, Lampetra japonica: electron-probe X-ray microanalysis.
abstract: In the thyroid follicles of species of cyclostomes, a hagfish and a lamprey, the distribution of stable iodine was examined by electron-probe X-ray microanalysis. A high concentration of stable iodine, heterogeneously distributed, was observed in the follicular cells of hagfish thyroid follicles. In the lamprey a low concentration of iodine was seen in the follicular lumina. The relative values for stable iodine determined in this way corresponded to values obtained by a chemical analytical method.
mesh_terms: D000818:Animals; D004577:Electron Probe Microanalysis; D006196:Hagfishes; D007454:Iodides / Q000032:analysis*; D007798:Lampreys; D008855:Microscopy, Electron, Scanning; D013045:Species Specificity; D013961:Thyroid Gland / Q000648:ultrastructure*
chemical_list: D007454:Iodides