elongation to cease after 70-100 amino acids had been incorporated. When microsomes containing the SRP receptor also were added to the incubations. the block in protein synthesis was relieved te protein minus the signal sequence was extruded into the lumen of the ln cI 3. Answer: Dephosphorylation events during mitosis include protein phosphatases removing the regulatory phosphates from lamins A, B, and C, permitting reassembly of the nuclear laminae of the two daughter cell nuclei. When MPF activity falls during anaphase, a constitutive phosphatase dephosphory -lares inhibitory sites on myosin light chain, allowing cytokinesis to proceed4 elongation to cease after 70-100 amino acids had been incorporated. When microsomes containing the SRP receptor also were added to the incubations, the block in protein synthesis was relieved and the complete protein minus the signal sequence was extruded into the lumen of the microsomes. 3. Answer:Dephosphorylation events during mitosis include protein phosphatases removing the regulatory phosphates from lamins A, B, and C, permitting reassembly of the nuclear laminae of the two daughter cell nuclei. When MPF activity falls during anaphase, a constitutive phosphatase dephosphory-lares inhibitory sites on myosin light chain, allowing cytokinesis to proceed