Why not?, physicists Luis Anchordoqui and Eugene Chudnovsky of The City University of New York ask. Why should life elsewhere resemble life on Earth?:
It all depends on how you define life. If the key criteria are the ability to encode information, and the ability for those information carriers to self-replicate faster than they disintegrate, then hypothetical monopole particles threaded on cosmic strings – cosmic necklaces – could form the basis of life inside stars, much like DNA and RNA form the basis of life on Earth.Michelle Starr, “A Strange Form of Life Could Flourish Deep Inside of Stars, Physicists Say” at ScienceAlert
Paper. (open access)
This would seem to be string theory’s contribution to biology: At a time when we haven’t yet located fossil bacteria on Mars (of which there is at least a plausible hope), we are asked to accept that there might be formations within stars that we would not identify as life but really are. String theory is then about as fruitful in biology as it is in cosmology.