👉 Opsins, also known as opsin-like proteins or opsin-1, are a family of membrane-bound, secretory vesicles that form in the endoplasmic reticulum (ER) and are involved in the transport of several substances such as hormones, neurotransmitters, and other molecules. These proteins are highly conserved among different species, but some differences have been observed between species due to evolutionary adaptations and natural selection. In human cells, opsin-like proteins play a crucial role
