Question: What distinguishes lantibiotics from antibiotics?

Context:
One potentially interesting class of antimicrobials are the modified bacteriocins termed lantibiotics, which are bacterially produced, posttranslationally modified, lanthionine/methyllanthionine-containing peptides.
low levels of resistance have been reported for lantibiotics compared with commercial antibiotics
Mechanisms that hinder the action of lantibiotics are often innate systems that react to the presence of any cationic peptides/proteins or ones which result from cell well damage, rather than being lantibiotic specific.
Lantibiotics are biologically active peptides produced by Gram-positive bacteria. 
Lantibiotics are post-translationally modified, ribosomally synthesised antimicrobial peptides with a broad spectrum antimicrobial activity.
Lantibiotic compounds are ribosomally synthesized antimicrobial peptides against which bacteria are not able to produce resistance, hence making them a good alternative to antibiotics.
Lantibiotics are ribosomally synthesized peptide antibiotics that are posttranslationally modified to introduce (methyl)lanthionine bridges.
Lantibiotics are defined as peptide antibiotics containing the unusual amino acids mesolanthionine, 3-methyllanthionine, dehydroalanine, and dehydrobutyrine.
Lantibiotics are antibiotic peptides distinguished by the presence of the rare thioether amino acids lanthionine and/or methyllanthionine.
Lantibiotics are ribosomally synthesized, post-translationally modified, peptide antibiotics containing unusual amino acids such as dehydrated amino acids and lanthionine.
Lantibiotics are peptide antibiotics, realizing their unique secondary structure by posttranslational modifications, the most important one being the formation of the characteristic amino acid lanthionine.
Lantibiotics are lanthionine-containing peptide antibiotics. 
Lantibiotics, a group of lanthionine-containing peptides, display their antibiotic activity by combining different killing mechanisms within one molecule. 
Lantibiotics are ribosomally synthesized as prepeptides, which are posttranslationally modified.

Answer: Lantibiotic compounds are ribosomally synthesized antimicrobial peptides against which bacteria are not able to produce resistance, hence making them a good alternative to antibiotics. It is interesting that low levels of resistance have been reported for lantibiotics compared with commercial antibiotics. Given that there are very few examples of naturally occurring lantibiotic resistance, attempts have been made to deliberately induce resistance phenotypes in order to investigate this phenomenon. Other general forms of resistance include the formation of spores or biofilms, which are a common mechanistic response to many classes of antimicrobials.
One potentially interesting class of antimicrobials are the modified bacteriocins termed lantibiotics, which are bacterially produced, posttranslationally modified, lanthionine/methyllanthionine-containing peptides. Low levels of resistance have been reported for lantibiotics compared with commercial antibiotics. Nisin is the oldest and the most widely used lantibiotic, in food preservation, without having developed any significant resistance against it.
One potentially interesting class of antimicrobials are the modified bacteriocins termed lantibiotics, which are bacterially produced, posttranslationally modified, lanthionine/methyllanthionine-containing peptides.
Exact answer: Lantibiotics are post-translationally modified natural peptides containing lanthionine