"blood island" as substance?

[spyysalo]

From SOLS lookup against the selected ontologies:

blood island (ZFA:0000094) -is_a- portion of tissue (ZFA:0001477)

blood island (XAO:0000067) -part_of- hematological system (XAO:0000122) -is_a- anatomical system (XAO:0003002) -is_a- anatomical group (XAO:0003001)

blood island (TAO:0000094) -part_of- intermediate cell mass of mesoderm (TAO:0000033) -part_of- hematopoietic system (TAO:0005023) -is_a- anatomical system (TAO:0001439) -is_a- anatomical group (TAO:0001512)

blood island (UBERON:0003061) -is_a- developing anatomical structure (UBERON:0005423)

caudal hematopoietic tissue (ZFA:0000094) -synonym_exact- blood island (ZFA:0000094)

see also http://en.wikipedia.org/wiki/Blood_island_of_umbilical_vesicle