EVACUATED STOPPERED TUBES FOR COLLECTION OF BLOOD SAMPLES AND FOR BLOODDRAWING ASSEMBLIES, SAID EVACUATED STOPPERED TUBES COMPRISING A TUBE HAVING AN OPEN END AND A CLOSED END, SAID TUBE HAVING A REDUCED DIAMETER ALONG THAT PORTION OF ITS LENGTH MOST PROXIMATE TO ITS OPEN END SO AS TO MAINTAIN A SEAL WITH THE STOPPER