5349
Saturation binding assays showed that mFpr1 and mFpr2 were expressed at similar levels on the cell surface , although their affinity for N - formyl - Met - Leu - Phe - Ile - Ile - Lys - fluorescein isothiocyanate varied by more than 1000 - fold [ dissociation constant ( K ( d ) ) values of 2 . 8 nM for mFpr1 and 4 . 8 mu M for mFpr2 ] ) .
 Chemical: N - formyl - Met - Leu - Phe - Ile - Ile - Lys - fluorescein isothiocyanate
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: N - formyl - Met - Leu - Phe - Ile - Ile - Lys - fluorescein isothiocyanate