Part of this work was supported financially by the Institut des
Nutraceutiques et des Aliments Fonctionnels (INAF). Streptococcus
thermophilus and L. delbrueckii subsp. bulgaricus were
provided by Abiasa Co. Lacbacillus johnsonii La-1 was
provided by Nestlé Company (Dr. R. Zink), Lausanne,
Switzerland.