5420
These results identify Ser - 7 as a major site for basal and PKC - stimulated phosphorylation of native and expressed DAT and suggest that Ser - 7 phosphorylation modulates transporter conformational equilibria , shifting the transporter between high and low affinity cocaine binding states .
 Chemical: Ser; Chemical: Ser; Chemical: cocaine
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: Ser; Chemical: Ser; Chemical: cocaine