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<p>Neutrophils represent up to half of all [[Leukocytes - WikiBlood|leukocytes]] in the blood stream and are distinguished by their irregular multi-lobed nucleus and indistinct granular appearance.  They are 10-12µm and circulate in the blood for minutes to hours (average 6-8 hours) and lasting for 1-2 days in tissue. Although the most abundant leukocyte in the blood the vast majority of neutrophils are found in the [[Bone Marrow - Anatomy & Physiology|bone marrow]] (5x more). Neutrophils play a key role during bacterial infections and have both [[#Phagocytosis|phagocytic]] and [[#Killing|killing]] actions.</p>

<p>Neutrophils represent up to half of all [[Leukocytes|leukocytes]] in the blood stream and are distinguished by their irregular multi-lobed nucleus and indistinct granular appearance.  They are 10-12µm and circulate in the blood for minutes to hours (average 6-8 hours) and lasting for 1-2 days in tissue. Although the most abundant leukocyte in the blood the vast majority of neutrophils are found in the [[Bone Marrow - Anatomy & Physiology|bone marrow]] (5x more). Neutrophils play a key role during bacterial infections and have both [[#Phagocytosis|phagocytic]] and [[#Killing|killing]] actions.</p>

<p>Neutrophils are called heterophils in birds, reptiles and some mammals.</p>

<p>Neutrophils are called heterophils in birds, reptiles and some mammals.</p>

==Development==

==Development==