involuted dorsal mesoderm,involuted ventral mesoderm,Eberth-Kastschenko layer,abdominal myoblast,anterior notochord,anterior ventral blood island,archenteron roof midline,axial ossicle,caudal presomitic mesoderm,cranial skeleton,dermatome,dermomyotome,dorsal endoderm,dorsomedial edge of myotome,flexural organ,hematopoietic stem cell,left-right organizer,left-right organizer primordium,macrophage,mandibular mesenchyme,migrating macrophage,monociliated cell,myocoelic slit,myotome,neutrophil,notochordal sheath,perichordal tissue,postcranial axial skeleton,posterior notochord,posterior ventral blood island,prechordal plate,presomitic mesoderm,rib,rostral presomitic mesoderm,sclerotomal cartilage,sclerotomal mesenchyme,sclerotome,stratum compactum,stratum spongiosum,syndetome,thrombocyte,transverse process,urostyle,vacuolated notochordal tissue,ventral blood island border,ventrolateral edge of myotome,vertebra,vertebral centrum,vertebral column,vertebral element,anterior ventral blood island,axial mesoderm,axial skeleton,blood,cervical vertebra,cloacal sphincter,dermatome,dermis,elastica externa,erythroid cell,flexural organ,gastrocoel roof plate,head somite 1,head somite 2,head somite 3,head somite 4,migrating macrophage,myeloid cell,myotome of head somite 1,myotome of head somite 2,myotome of head somite 3,myotome of head somite 4,myotome of tail somite 14,myotome of tail somite 15,myotome of tail somite 16,myotome of tail somite 17,myotome of tail somite 18,myotome of trunk somite 1,myotome of trunk somite 10,myotome of trunk somite 11,myotome of trunk somite 12,myotome of trunk somite 13,myotome of trunk somite 2,myotome of trunk somite 3,myotome of trunk somite 4,myotome of trunk somite 5,myotome of trunk somite 6,myotome of trunk somite 7,myotome of trunk somite 8,myotome of trunk somite 9,notochord,notochordal epithelium,paraxial mesoderm,posterior ventral blood island,presomitic mesoderm,presumptive axial mesoderm,presumptive paraxial mesoderm,proctodeum,sacral vertebra,sclerotome of head somite 4,sclerotome of tail somite 14,sclerotome of tail somite 15,sclerotome of tail somite 16,sclerotome of tail somite 17,sclerotome of tail somite 18,sclerotome of trunk somite 1,sclerotome of trunk somite 10,sclerotome of trunk somite 11,sclerotome of trunk somite 12,sclerotome of trunk somite 13,sclerotome of trunk somite 2,sclerotome of trunk somite 3,sclerotome of trunk somite 4,sclerotome of trunk somite 5,sclerotome of trunk somite 6,sclerotome of trunk somite 7,sclerotome of trunk somite 8,sclerotome of trunk somite 9,somite,tail somite 14,tail somite 15,tail somite 16,tail somite 17,tail somite 18,thrombocyte,trunk somite 1,trunk somite 10,trunk somite 11,trunk somite 12,trunk somite 13,trunk somite 2,trunk somite 3,trunk somite 4,trunk somite 5,trunk somite 6,trunk somite 7,trunk somite 8,trunk somite 9,urostyle,ventral blood island,ventral mesoderm,vitelline vein