| It is unclear which or how many wild species or cultigens were the progenitors of the extant avocado races. |
| Currently, six major tetraploid races are recognized and their diploid progenitors have been identified. |
| The result is premature apoptosis of progenitors and failure of stem cells to mature and differentiate. |
| The progenitors of osteoclasts are from the hematopoietic cell line and the osteoblasts originate from the marrow stroma. |
| Note that copy numbers in tetraploids were slightly less than double those in respective diploid progenitors. |
| Most of the nobly born have at one time or another sought to find progenitors among the Companions of the Conqueror. |
