Aptamer

 Aptamers ( come from the Latin aptus - fit, and Greek word meros-

Most of the aptamers molecules are made by selecting them from a wide sequnce pool. On the other the natural aptamers are found in riobswitches. 

These aptamers are divided into two groups : 

1) Nucleic acid : DNA and RNA aptamers. 

2) Peptides 

Uses of RNA aptamers : 

1) Biosensors ( that can detec how much toxin in a solution ) 

2) Drug targeting agents ( specific recognition of caner cells ) 

3) Gene regulatio ( targets for antibacterial drugs )