platelet factor造句怎么写

Objective To observe the changes of plasma platelet factor 4 (PF4) in patients with cerebral infarction before and after Bayaspirin treatment.

Clone, expression, purification and quantitative bioassay of recombinant human platelet factor 4;

Method: To measure the phased availability of platelet factor Ⅲ with kaolin timing method,counting the platelet synchronously.

Obtaining of human platelet factor 4 by means of genetic engineering technique