def bowtie_database():
db = get_database('bowtie', readonly=True)
yield db
db.close()
def perturb_database():
db = get_database('perturb', readonly=True)
yield db
db.close()
def three_database():
db = get_database('three', readonly=True)
yield db
db.close()
def xor_database():
db = get_database('xor', readonly=True)
yield db
db.close()
