What's the rhythmic flow in poetry?

Could someone tell me whats missing from this flow chart?

• The flow chart shows steps in the process of Gene Therapy. 1) identify the gene that causes Cystic Fibrosis | 2) Remove the allele from a person who does not have Cystic Fibrosis | 3) ........................................... | 4) Put copies of the normal gene into cells of Cystic Fibrosis patients | 5) After a period of time, check to see if the normal gene is present in the cells of the patients

• Answer:

  3) Place the allele into the Cystic Fibrosis patent