30664
In thyroid stem / progenitor cells derived from nodular goitres the ability of 17beta - oestradiol to induce thyrosphere formation , the expression of oestrogen receptors and the effect of 17beta - oestradiol on growth , expression of marker of stem cells and thyroid differentiation ( TSH receptor , thyroperoxidase , thyroglobulin , sodium iodide symporter expression ) were analysed .
 Chemical: 17beta - oestradiol; Chemical: oestrogen; Chemical: 17beta - oestradiol; Chemical: sodium iodide
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: 17beta - oestradiol, oestrogen, 17beta - oestradiol, sodium iodide 
Answer:
 Chemical: 17beta - oestradiol; Chemical: oestrogen; Chemical: 17beta - oestradiol; Chemical: sodium iodide