The paper "Regulation of the Mammalian Pineal by Non-rod, Non-cone, Ocular Photoreceptors by Robert" is a good example of an article on biology. According to Robert et al (1999), melatonin is the main product of the mammalian gland. He argues that production of this gland occurs only in the dark. This gland is unique as compared to that of other vertebrates, for it is not sensitive to light. However, photic information reaches it through the retina in the eye (Robert et al 505). Thus, he contends that removal of the eye stops this response, hence a proof of the use of ocular photoreceptors. The experiment involved the use of mice that were short of rod and cone photoreceptors (Robert et al 506). Achievement of this occurred by the introduction of the cl transgene, utilized in inactivation of rod phototransduction. Examination of 80-day-old mice disclosed the absence of the retina in their outer nuclear stratum (Robert et al 505). Robert et al (1999) argue that past scientific beliefs on mammals contrast the recent arguments by research. Mammals utilize uncharacterized ocular photoreceptors in their nervous system (Robert et al 505). In the quest to prove this belief, Robert et al carried out an experiment to scrutinize the photic control of pineal melatonin in mice (Robert et al 506). The findings had a basis on the non-glowing nature of the response. The experiment revealed that light is paramount for its results to an acute effect on the activity of the pineal. Thus, the experiment revealed that rd/rd cl mice are able to sense the presence of illumination (Robert et al 506). Therefore, mice possess cells which are responsible for receiving light. The retina contains the cells, which is the source of all photoreceptive input. Removal of the retina is evidence that the eyes of mammals contain components vital for the passage of light.