FIGS. 4-9. The effect of age of donor embryo on the size of cell aggregates. Aggregation
patterns of neuro-retina cells from 7-, 9-, 12-, 14-, 16- and 19-day chick embryos; 24-h
cultures in standard medium, 38°C, 70 rev/min, Erlenmeyer flasks (25 ml; 3 ml. culture
medium).