Mature formed elements that have a nucleus but do not have hemoglobin are

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Leukocytes, or white blood cells, are mature formed elements that have a nucleus but do not have hemoglobin. This distinguishes them from erythrocytes (red blood cells), which do have hemoglobin but lack a nucleus, thrombocytes (platelets), which are cell fragments that lack a nucleus, megakaryocytes, which are precursors to platelets and also lack a nucleus, and reticulocytes, which are immature red blood cells that do have hemoglobin but lack a fully developed nucleus.

Mature Formed Elements That Have a Nucleus but Do Not