26920
The effects of substituting l - deoxynucleotide for d - deoxynucleotide at duplex termini were evaluated and the terminal substitutions were found to show much less effects on duplex destabilization and to show a similar tendency in base pairing selectivity , compared with internal chiral substitutions .
 Chemical: l - deoxynucleotide; Chemical: d - deoxynucleotide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: l - deoxynucleotide; Chemical: d - deoxynucleotide