👉 The term "pronuclei" is often used in biochemistry to refer to the structures that contain DNA and RNA within a cell. Pronuclei are found in the nucleus of eukaryotic cells, which have two types of nucleoli: proline-rich nuclear domains (PRNs) and non-proline-rich nuclear domains (NRDs). The presence of PRNs allows for the assembly of functional proteins, while NRDs prevent the formation of a misfolded protein. Pronuclei