3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium
bromide (MTT) were obtained from Sigma-Aldrich, Inc (St Louis, MO). Calcein
acetoxymethyl ester (calcein-AM) was purchased from Dojindo Laboratories
(Kumamoto, Japan). Recombinant mouse IL-2 was obtained from Roche Applied
Science (Indianapolis, IN). Oligodeoxynucleotide (ODN) 1585 and its negative
control were purchased from InvivoGen (San Diego, CA). Mouse NK cell separation
set-DM, mouse NK cell enrichment set-DM, and phycoerythrin (PE)-conjugated rat
anti-mouse NK1.1, fluorescein isothiocyanate (FITC)-conjugated hamster
anti-mouse CD3 ϵ chain, and rat anti-mouse CD16/CD32 monoclonal antibodies
(mAbs) were obtained from BD Biosciences (San Jose, CA).