part of meiotic M phase meiosis I cell cycle phase meiotic prometaphase I https://github.com/geneontology/go-ontology/issues/24374 GO:0098768 The meiotic cell cycle phase in eukaryotes between meiotic prophase I and meiotic metaphase I. During meiotic prometaphase I, the nuclear envelope breaks down and one kinetochore forms per chromosome. Chromosomes attach to spindle microtubules and begin to move towards the metaphase plate. biological_process This term should not be used for direct annotation. If you are trying to make an annotation to x phase, it is likely that the correct annotation should be to 'regulation of x/y phase transition' or to a process which occurs during the reported phase (e.g. mitotic DNA replication for mitotic S-phase). To capture the phase when a specific location or process is observed, the phase term can be used in an annotation extension (PMID:24885854) applied to a cellular component term (with the relation exists_during) or a biological process term (with the relation happens_during).