Leo Reapさんのイラストまとめ

Platelets don’t only mature within the bone marrow.

Immature platelets can be released early in times of physiological stress or thrombocytopenia. This is partly why giant platelets are seen in conditions like ITP!

Some of maturation is also thought to occur in the lung:

Right! Megakaryocytes (MK) are the mother of all platelets.

As the name implies, these cells are HUGE and easily identified by their large granular cytoplasm and lobulated nucleus.