TY - GEN AU - Tompa,A S TI - Embryonic use of egg shell calcium in a gastropod SN - 0028-0836 PY - 1975///1010 KW - Animals KW - Calcification, Physiologic KW - Calcium KW - analysis KW - Calcium Radioisotopes KW - Egg Shell KW - Embryo, Nonmammalian KW - Mollusca KW - embryology N1 - Publication Type: Journal Article UR - https://doi.org/10.1038/255232a0 ER -