Monocytes ingest foreign or dangerous substances and present antigens to other cells of the immune system. Monocytes form two groups: a circulating group and a marginal group that remain in other tissues (approximately 70% are in the marginal group).hey are called non-professional phagocytes, to emphasize that, in contrast to professional phagocytes, phagocytosis is not their principal function. Fibroblasts, for example, which can phagocytose collagen in the process of remolding scars, will also make some attempt to ingest foreign particles.
1 0.3-5 mg at bedtime is a typical dose. 2  In children with insomnia due to delayed sleep onset, melatonin 5 mg at 6:00 PM daily. 3  In children with developmental disorders (including cerebral palsy, autism, and intellectual disabilities), melatonin 5 mg at 8:00 PM daily.
In fact, melatonin production peaks around age 5 and starts a downhill slide from there. Unfortunately, we lose up to 80 percent of those original levels by the time we reach 60. And that's likely one of the reasons we don't sleep as well when we get older. When you're 20 and can easily sleep until noon, your levels of melatonin average about 80 picograms per milliliter; at 60, those levels drop down to 10. At age 20 you might have had a level of 10 in the late afternoon.