64. Yu, H.; Cheng, J.; Ding, L.; Khedri, Z.; Chen, Y.; Chin, S.; Lau, K.; Tiwari, VK, *Chen, X.
Chemoenzymatic synthesis of GD3 oligosaccharides and other disialyl glycans containing natural and non-natural sialic acids.
J. Am. Chem. Soc. 2009, 131, 18467-18477. PMID: 19947630. DOI: 10.1021/ja907750r

63. Pham, T.; Gregg, C.; Karp, F.; Chow, R.; Padler-Karavani, V.; Cao, H.; Chen, X.; Witztum, J. L.; Varki, N. M.; *Varki, A.
Evidence for a novel human-specific xeno-auto-antibody response against vascular endothelium. 
 2009, 114, 5225-5235. PMID: 19828701. DOI 10.1182/blood-2009-05-220400

62. Cao, H.; Li, Y.; Lau, K. ; Muthana, S. ; Yu, H.; Cheng, J.; Chokhawala, H. A.; Sugiarto, G.; Zhang, L.; *Chen, X.
Sialidase substrate specificity studies using chemoenzymatically synthesized sialosides containing C5-modified sialic acids. 
Org. Biomol. Chem.
 2009, 7, 5137-5145.

61. Muthana, S.; Cao, H.; *Chen, X.
Recent progress in chemical and chemoenzymatic synthesis of carbohydrates. Invited review. 
Curr. Opin. Chem. Biol
2009, 13, 573-581. PMID: 19833544

60. Cao, H.; Muthana, S.; Li, Y.; Cheng, J.; *Chen, X.
Parallel chemoenzymatic synthesis of sialosides containing a C5-diversified sialic acid.
Bioorg. Med. Chem. Lett. 2009, 19, 5869-5871. PMID: 19740656. PMC2753693. [Supporting information]

59. Linman, M. J.; Yu, H.; Chen, X.; *Cheng, Q.
Fabrication and characterization of a sialoside-based carbohydrate microarray biointerface for protein binding analysis with surface Plasmon resonance imaging. 
ACS Appl. Mater. Interfaces 
2009, 1,1755-1762

58. Muthana, S.; Yu, H.; Cao, H.; Cheng, J.; *Chen, X.
Chemoenzymatic synthesis of a new class of macrocyclic oligosaccharides. 
J. Org. Chem. 
2009, 74, 2928-2936. PMID: 19296596. Featured article. [Supporting information]

57. Yi, W.; Liu, X.; Li, Y.; Li, J.; Xia, C.; Zhou, G.; Zhang, W.; Chen, X.; *Wang, P.G.
Remodeling bacterial polysaccharides by metabolic pathway engineering. 
Proc. Natl. Acad. Sci. U.S.A. 
2009, 106, 4207-4212. PMID: 19251666. PMCID: PMC2657399. [Supporting information] [Appendix] [News]

56. Diaz, S. L.; Padler-Karavani, V.; Ghaderi, D.; Hurtado-Ziola, N.; Yu, H.; Chen, X.; Brinkman-Van der Linden, E. C. M.; *Varki, A.; Varki, N. M.
Sensitive and specific detection of the non-human sialic acid N-glycolylneuraminic acid in human tissues and biotherapeutic products. 
2009, 4, e4241 (1-10). Open Access.

55. Wong, J. H.; Sahni, U.; Li, Y.; Chen, X.; *Gervay-Hague, J.
Synthesis of sulfone-based nucleotide isosteres: identification of CMP-sialic acid synthetase inhibitors. 
Org. Biomol. Chem. 
2009, 7, 27-29. [Supporting information]

54. Yu, H.; *Chen X.
Enzymatic synthesis of carbohydrate-containing biomolecules.
In Wiley Encyclopedia of Chemical Biology. Chief Advisor: Tadhag P. Begley, John Wiley & Sons, Inc. NJ, 2009, 1, 631-652. ISBN: 978-0-471-75477-0.