One group of hormones, called cytokines, has been found to promote the activity of white blood cells, which are needed to ward off viral and bacterial infections and which destroy potential cancer cells.
बिलब्रो कहता है, “हम चालीस के दशक की वैक्यूम ट्यूबों की दुबारा जाँच कर रहे हैं ।