 Some challenges associated with studies that use D-amino acids are that cell walls found in other life, such as archaea or plants/ fungi in eukaryotes, are not composed with D-amino acids. They are also naturally less digestible and utilizable as microbial growth substrates compared with L-amino acids.
<coherence>  Some challenges associated with studies that use D-amino acids are that cell walls found in other life, such as archaea or plants/ fungi in eukaryotes, are not composed with D-amino acids. They are also naturally less digestible and utilizable as microbial growth substrates compared with L-amino acids.