Eyes on the skin. In the teamâs first experiment, the scientists were looking to see whether UV light instigated a calcium signaling response. They found nothing. But guessing that the skin might sense light like the eyes do, they added retinal, a co-factor of opsin receptors including rhodopsin.
Economy shipping takes 1 to 10 business days within the United States and 11 to 20 business days for international. Exact time depends on how far the package must travel. Standard international shipping takes 5 to 10 days.
1 Free Economy shipping (single address) for orders where the subtotal after coupons/discounts is over $100. 2  Available only to on-line orders shipping within the Contiguous U.S. (excluding PO Boxes/APO/FPO). 3  Allow 5-10 business days for delivery.