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Location and structure of the crayfish APC and different parts of hematopoietic tissue. Shown is the location of the APC and HPT in crayfish underneath the carapace. The HPT covers the dorsal part of the stomach. The HPT is divided into two parts, the posterior HPT (blue in A and B) and anterior HPT (gray in A and B). The APC (green in A and B) is a special small area in the anterior part of the HPT.
