Could lone subatomic particles be "stabilised" if placed in larger molecules? My main area is molecular biology and biochemistry, but I've had a growing interest in particle physics for a while. Could lone subatomic particles be "stabilised" if they were placed inside of a larger molecule? For example, is there a reason why a Mg atom at the center of a chlorophyll molecule's chlorin ring, or the Co atom coordinated in cobalamin, can't be replaced with a delta baryon of +2 charge? (The Mg and Co are +2 as well in those molecules) Could positrons be stored inside of a fullerene molecule (a sphere made entirely of carbon rings?) If the walls are all organic and uncharged, shouldn't they repel the positively charged positron towards the center? Could this be a possible viable way to capture and store exotic subatomic particles?