<Tr> <Td> Peptidergic neuron - like cells </Td> <Td> In some species, neuronal - like peptidergic cells are present . These cells might have a paracrine regulatory function . </Td> </Tr> <P> In some parts of the brain and in particular the pineal gland, there are calcium structures, the number of which increases with age, called corpora arenacea (or "acervuli," or "brain sand"). Chemical analysis shows that they are composed of calcium phosphate, calcium carbonate, magnesium phosphate, and ammonium phosphate . In 2002, deposits of the calcite form of calcium carbonate were described . Calcium and phosphorus deposits in the pineal gland have been linked with aging . </P> <P> The human pineal gland grows in size until about 1--2 years of age, remaining stable thereafter, although its weight increases gradually from puberty onwards . The abundant melatonin levels in children are believed to inhibit sexual development, and pineal tumors have been linked with precocious puberty . When puberty arrives, melatonin production is reduced . </P> <P> In the zebrafish the pineal gland does not straddle the midline but shows a left - sided bias . In humans, functional cerebral dominance is accompanied by subtle anatomical asymmetry . </P>

When does the pineal gland develop in a fetus
find me the text answering this question