Assign a new OTU table in microbiomeMarker object
     
    
    # S4 method for microbiomeMarker,otu_table
otu_table(x) <- value
# S4 method for microbiomeMarker,phyloseq
otu_table(x) <- value
# S4 method for microbiomeMarker,microbiomeMarker
otu_table(x) <- value