Final answer:
A stem cell from a mammalian embryo that can produce all of the embryo's cells but not extraembryonic tissues is a pluripotent stem cell. Pluripotent stems cells come from totipotent cells and can become any human tissue but don't possess the ability for full organismal development. These should not be confused with more restricted multipotent stem cells or fully specialized differentiated cells.
Step-by-step explanation:
Stem cells derived from mammalian embryos that can produce all of the cells of the embryo, but none of the extraembryonic lineages, are known as pluripotent stem cells. These cells originate from totipotent stem cells and are precursors to the fundamental tissue layers of the embryo. As the embryo develops, their potential begins to narrow, even though they still retain the ability to differentiate into any type of human tissue. However, they lack the ability to form an entire living organism on their own.
A more specialized type of stem cell is the multipotent stem cell, which can give rise to different cell types within a given cell lineage or a small number of lineages, such as those related to blood cells. However, at the stage of development asked in the question, the correct answer is that the stem cell is pluripotent, not multipotent, totipotent, or differentiated.