Combinatorial selection of high affinity RNA ligands to live African trypanosomes

african trypanosomiasis animal diseases antiprotozoaire antiprotozoal agents arn biochemistry biochimie biological differences enfermedades de los animales enfermedades humanas human diseases ligand ligandos ligands maladie de l'homme maladie des animaux medicamentos contra protozoarios methode methods proteine proteins rna strain differences tripanosomiasis trypanosoma trypanosoma brucei trypanosomiasis trypanosomose