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The main aims of this work were to examine in women : the relationship between the freely exchangeable Ca2+ ( FECa2+ ) in the dense tubules and the activity of the sarco(endo)plasmic reticulum ( SER ) Ca2+-ATPase ( SERCA ) in platelets , and the relationship of these parameters with blood pressure and serum lipoproteins .
 platelets, SERCA, Ca2+-ATPase, serum lipoproteins, sarco(endo)plasmic reticulum ( SER ) Ca2+-ATPase ( SERCA )
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 platelets, SERCA, Ca2+-ATPase, serum lipoproteins, sarco(endo)plasmic reticulum ( SER ) Ca2+-ATPase ( SERCA )