6974
Fluorescence spectroscopic and cytofluorimetric studies showed that the incubation of MCF - 7 tumour cells with fluorescein - labelled stearoyl - PEG - polySDM at pH 6 . 5 resulted in massive time - dependent cell association , while the incubation at pH 7 . 4 showed significantly lower cell interaction .
 Chemical: fluorescein; Chemical: stearoyl - PEG - polySDM
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: fluorescein; Chemical: stearoyl - PEG - polySDM