FIELD I 

 Columns 3 5 and 36 



7S Lower epidermis of leaf 



7T Parenchyma (tissue of origin unspecified) 



8 



and Reserved for additional specific tissues 



9 



(A) Cells. The items of this symbol series (A-) are to be used to distinguish between cells 



differing in the characteristic specified (e. g. , dye affinity) or to distinguish particular 

 unique cells of an organ coded in Field H. Symbol A, alone, is not intended for coding use. 



Al Acidophile; eosinophile 



A2 Basophiie 



A3 Neutrophile; chromophobic cell; heterophile (including "polymorphs" of blood) 



A4 Reticule- endothelial cell; Kupffer cell of the liver 



(B) Cell components and cell inclusions. Symbol B, alone, is not intended for coding use. 

 81 Nucleus, in toto 



B2 Nucleolus 



B3 Nucleoplasm; karyoplasm 



B4 Nuclear membrane 



B5 Cytoplasm 



B6 Cell membrane (protoplasmic membrane) 



B7 Cell wall of plants (of cellulose, lignin, etc. ) 



B8 Middle lamella (of plant cell wall) 



B9 Primary wall (of plant cell wall) 



BA Secondary wall (of plant cell wall) 



BB Plasmodesma 



BG Mitochondria; chondriosome 



BD Golgi body; Golgi apparatus 



BE Fibril (including neurofibril and myofibril) 



BE Basophiie granule; Nissl granule 



BG Cilium; flagellum 



BH Vacuole 



BI Intracellular fluid; cell sap 



BJ Secretion granule; zymogen 



BK Plastid (including chloroplast, leukoplast, chromoplast, and pyrenoid) 



C Structures (other than specific tissue types) which are components of an organ coded in Field H. 



CI Blood vessel 



C2 Capillary; capillary bed; capillary plexus 



C3 Artery 



C4 Vein 



C5 Lymph vessel 



C6 Lymphoid nodule (of a specific body area) 



07 Lymphoid tissue 



CS Venous sinus 



C9 Mucous membrane 



CA Acinus (of the gland coded in Field H-1) 



CB Dermis, in toto (of the body part coded in Field H-1) 



D Embryonic tissue 



Dl Ectoderm 



D2 Endoderm 



D3 Mesoderm 



D4 Mesenchyme 



D5 Embryonic membrane, unspecified 



D6 Allantoic sac 



D7 Yolk sac 



D8 Amnion 



D9 Chorion 



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