TY - GEN AU - McLaren,A TI - Numerology of development SN - 0028-0836 PY - 1972///1204 KW - Cell Differentiation KW - Clone Cells KW - Cytogenetics KW - Mathematics KW - Mosaicism KW - Sex Chromosomes N1 - Publication Type: Journal Article UR - https://doi.org/10.1038/239274a0 ER -